QC 
813 

U6 


SB    b34    257 


W.B.Na.235. 

U.  S.  DEPARTMENT  OF  AGRICULTURE, 

WEATHER  BUREAU. 

CHARLES  F.  MARVIN,  CfflBF. 


PSYCHROMETRIC  TABLES 


FOR  OBTAINING  THE 


VAPOR  PRESSURE,  RELATIVE  HUMIDITY,  AND 
TEMPERATURE  OF  THE  DEW-POINT. 


PROM  READINGS  OF  THE  WET  AND  DRY 
BULB  THERMOMETERS. 


BY 
O.  F.  MAHVIN. 


WASHINGTON: 

GOVERNMENT  PRINTING  OFFICE. 
1915. 


W.  B.  N  3,  235. 

U.  S.  DEPARTMENT  OF  AGRICULTURE, 

WEATHER  BUREAU. 
CHARLES  F.  MARVIN,  CHIEF. 


PSYCHROMETRIC  TABLES 


FOR  OBTAINING  THE 


VAPOR  PRESSURE,  RELATIVE  HUMIDITY,  AND 
TEMPERATURE  OF  THE  DEW-POINT. 


FROM  READINGS  OF  THE  WET  AND  DRY 
BULB  THERMOMETERS. 


BY 
O.  F.  MARVIN. 


WASHINGTON: 

GOVERNMENT  PRINTING  OFFICE. 
1915. 


U.  S.  DEPARTMENT  OF  AGRICULTURE, 

WEATHER  BUREAU, 
WASHINGTON,  l).  C.,  October  5,  1915. 

These  tables  were  first  published  in  1900  and  were  reprinted  in 
1910  with  the  addition  of  a  brief  appendix.  The  edition  of  1910 
was  reprinted  in  1912  and  is  now  again  reprinted  without  any 
alterations, 

CHARLES  F.  MARVIN, 

Chief  of  Bureau* 
(3) 


794865 


PSYCHROMETRIC  TABLES 


MEASUREMENT  OF  ATMOSPHERIC  MOISTURE. — The  quantity  of 
moisture  mixed  with,  the  air  under  different  conditions  of  tempera- 
ture and  degree  of  saturation  may  be  measured  in  several  dis- 
tinctly different  ways.  Many  of  these,  however,  are  not  practicable 
methods  for  daily  observations,  or  are  not  sufficiently  accurate. 
Probably  the  most  convenient  of  all  methods  and  the  one  most 
generally  employed  is  to  observe  the  temperature  of  evaporation — 
that  is,  the  difference  between  the  temperatures  indicated  by  wet 
and  dry-bulb  thermometers.  The  most  reliable  instrument  for 
this  purpose  is  the  sling,  or  whirled  psychrometer.  In  special 
cases  rotary  fans,  or  other  means,  may  be  employed  to  move  the 
air  rapidly  over  the  thermometer  bulbs.  In  any  case  satisfactory 
results  can-not  be  obtained  from  observations  in  relatively  stag- 
nant air.  A  strong  ventilation  is  absolutely  necessary  to  accuracy. 

SLING  PSYCHROMETER. — This  instrument  consists  of  a  pair  of 
thermometers,  provided  with  a  handle  as  shown  in  fig.  1,  which 
permits  the  thermometers  to  be  whirled  rapidly,  the  bulbs  being 
thereby  strongly  affected  by  the  temperature  of  and  moisture  in 
the  air.  The  bulb  of  the  lower  of  the  two  thermometers  is  covered 
with  thin  muslin,  which  is  wet  at  the  time  an  observation  is  made. 

THE  WET-BULB. — It  is  important  that  the  muslin  covering  for 
the  wet-bulb  be  kept  in  good  condition.  The  evaporation  of  the 
water  from  the  muslin  always  leaves  in  its  meshes  a  small  quantity 
of  solid  material,  which  sooner  or  later  somewhat  stiffens  the  mus- 
lin so  that  it  does  not  readily  take  up  water.  This  will  be  the  case 
if  the  muslin  does  not  readily  become  wet  after  being  dipped 
in  water.  On  this  account  it  is  desirable  to  use  as  pure  water  as 
possible,  and  also  to  renew  the  muslin  from  time  to  time.  New 
muslin  should  always  be  washed  to  remove  sizing,  etc.,  before 
being  used.  A  small  rectangular  piece  wide  enough  to  go  about 
one  and  one-third  times  around  the  bulb,  and  long  enough  to  cover 
the  bulb  and  that  part  of  the  stem  below  the  metal  back,  is  cut 
out,  thoroughly  wetted  in  clean  water,  and  neatly  fitted  around  the 
thermometer.  It  is  tied  first  around  the  bulb  at  the  top,  using  a 
moderately  strong  thread.  A  loop  of  thread  to  form  a  knot  is 
next  placed  around  the  bottom  of  the  "bulb,  just  where  it  begins  to 
round  off.  As  this  knot  is  drawn  tighter  and  tighter  the  thread 
sjlips  off  the  rounded  end  of  the  bulb  and  neatly  stretches  the  mus- 
lin covering  with  it,  at  the  same  time  securing  the  latter  at  the 
bottom. 

(5) 


6 


To  MAK^  AN  OBSERVATION. — The  so-called  wet-bulb  is  thoroughly 
saturated  with  water  by  dipping  it  into  a  small 
cup  or  wide-mouthed  bottle.  The  thermometers 
are  then  whirled  rapidly  for  fifteen  or  twenty 
seconds;  stopped  and  quickly  read,  the  wet-bulb 
first.  This  reading  is  kept  in  mind,  the  psychrome- 
ter  immediately  whirled  again  and  a  second  reading 
taken.  This  is  repeated  three  or  four  times,  or  more, 
if  necessary,  until  at  least  two  successive  readings 
of  the  wet-bulb  are  found  to  agree  very  closely, 
thereby  showing  that  it  has  reached  its  lowest  tem- 
perature. A  minute  or  more  is  generally  required 
to  secure  the  correct  temperature. 

When  the  air  temperature  is  near  the  freezing 
point  it  very  often  happens  that  the  temperature  of 
the  wet-bulb  will  fall  several  degrees  below  freez- 
ing point,  but  the  water  will  still  remain  in  the 
liquid  state.  No  error  results  from  this,  provided 
the  minimum  temperature  is  reached.  If,  however, 
as  frequently  happens,  the  water  suddenly  freezes, 
a  large  amount  of  heat  is  liberated,  and  the  tem- 
perature of  the  wet-bulb  immediately  becomes  32°. 
In  such  cases  it  is  necessary  to  continue  the  whirl- 
ing until  the  ice-covered  bulb  has  reached  a  mini- 
mum temperature. 

WHIRLING  AND  STOPPING  THE  PSYCHROMETER. — 
It  is  impossible  to  effectually  describe  these  move- 
ments. The  arm  is  held  with  the  forearm  about 
horizontal,  and  the  hand  well  in  front.  A  peculiar 
swing  starts  the  thermometers  whirling,  and  after- 
ward the  motion  is  kept  up  by  only  a  slight  but 
very  regular  action  of  the  wrist,  in  harmony  with 
the  whirling  thermometers.  The  rate  should  be  a 
natural  one,  so  as  to  be  easily  and  regularly  main- 
tained. If  too  fast,  or  irregular,  the  thermometers 
may  be  jerked  about  in  a  violent  and  dangerous 
manner. 

The  stopping  of  the  psychrometer,  even  at  the 
very  highest  rates,  can  be  perfectly  accomplished 
in  a  single  revolution,  when  one  has  learned  the 
knack.  This  is  only  acquired  by  practice,  and  con- 
sists of  a  quick  swing  of  the  forearm  by  which  the 
hand  also  describes  a  circular  path,  and,  as  it  were, 
follows  after  the  thermometers  in  a  peculiar  man- 
ner that  wholly  overcomes  their  circular  motion 


FlG.  1.— StINO  PSY- 
CH ROM  ETEK. 


without  the  slightest  shock  or  jerk.  The  thermometers  may,  with- 
out very  great  danger,  be  allowed  simply  to  stop  themselves ;  the 
final  motion  in  such  a  case  will  generally  be  quite  jerky,  but,  unless 
the  instrument  is  allowed  to  fall  on  the  arm,  or  strikes  some  object, 
no  injury  should  result. 

EXPOSURE. — While  the  psychrometer  will  give  quite  accurate 
indications,  even  in  the  bright  sunshine,  yet  observations  so  made 
are  not  without  some  error,  and,  where  greater  accuracy  is  desired, 
the  psychrometer  should  be  whirled  in  the  shade  of  a  building  or 
tree,  or,  as  may  sometimes  be  necessary,  under  an  umbrella.  In 
all  cases  there  should  be  perfectly  free  circulation  of  the  air,  and 
the  observer  should  face  the  wind,  whirling  the  psychrometer 
in  front  of  his  body.  It  is  a  good  plan,  while  whirling,  to  step 
back  and  forth  a  few  steps  to  further  prevent  the  presence  of  the 
observer's  body  from  giving  rise  to  erroneous  observations. 

DEW-POINT  APPARATUS. — The  apparatus  shown  in  .fig.  2  is  a 
modified  form  of  Regnault's  apparatus,  and  serves  to  determine 
directly  the  temperature  of  the  dew-point.  It  consists  essentially 
of  a  thin  polished  silver  tube,  a,  cemented  upon  the  lower  end  of 
a  longer  glass  tube,  as  shown.  The  stopper  closing  the  upper  end 
of  this  tube  is  fitted  with  two  lateral  tubes  of  hard  rubber,  b  and  c, 
and  carries  a  delicate  thermometer,  the  bulb  of  which  is  placed 
near  the  center  of  the  silver  tube.  The  tube  b  extends  to  the  bot- 
tom of  the  silver  tube;  c  projects  but  a  short  distance  through  the 
cork.  A  rubber  aspirating  apparatus,  as  shown,  is  connected  with 
the  tube  fr,  and  a  long  tube  joined  to  c  serves  to  carry  off  the  fumes 
generated  in  the  apparatus.  The  glass  tube  is  held  in  a  clamp 
faced  with  cork,  which  largely  intercepts  the  transfer  of  heat. 

Observations  are  made  by  filling  the  silver  cup  with  sulphuric 
ether,  or  similar  volatile  liquid,  which  is  caused  to  evaporate  and 
cool  the  silver  cup  in  the  desired  manner  by  manipulating  the 
aspiration  bulb.  At  the  proper  point  of  cooling,  a  deposit  of  dew 
is  seen  to  form  on  the  polished  silver  surface.  The  object  is  to 
ascertain  accurately  the  temperature  at  which  the  dew  will  just 
deposit.  For  this  purpose  it  is  necessary  that  the  temperature  be 
lowered  very  slowly  at  the  critical  point,  also  that  there  be  plenty 
of  liquid  in  the  cup  and  that  it  be  agitated  sufficiently  to  have  a 
uniform  temperature  throughout.  Finally,  the  surface  of  the 
silver  must  be  perfectly  clean  and  in  a  favorable  light,  so  that  the 
faintest  deposition  of  dew  is  at  once  visible.  The  temperature 
shown  by  the  thermometer  at  this  moment  may  be  regarded  as  the 
temperature  of  the  dew-point. 

In  order  that  the  presence  of  the  observer  shall  not  affect  the 
moisture  contents  of  the  air  in  the  vicinity  of  the  cup  during  an 
observation,  it  is  necessary  that  in  breathing  he  exhale  through  a 


suitable  tube  which  will  conduct  the  moist  air  from  his  lungs  to  a 
sufficient  distance.  It  is  further  advisable  that  a  very  gentle 
motion  be  given  to  the  air  near  the  cup  by  use  of  an  ordinary  fan. 
For  the  greatest  accuracy,  the  cup  should  be  allowed  to  warm  up 
and  the  deposition  of  dew  formed  several  times  in  succession,  a 
reading  of  the  temperature  being  made  at  each  deposition. 


FIG.  2.    DEW-POINT  APPABATUS. 

FAULTY  CONCEPTIONS.— A  false  notion  that  the  air  has  a  cer- 
tain capacity  for  moisture  is  widely  prevalent,  and  is  perpetuated 
by  all  such  expressions  as  ' '  The  air  is  partly  saturated  with  moist- 
ure," ;' Weight  of  aqueous  vapor  in  a  cubic  foot  of  saturated 
air"  etc. 

It  should  always  be  clearly  observed  that  the  presence  of  the 
moisture  in  any  given  space  is  independent  of  the  presence  or 


absence  of  air  in  the  same  space  except  that  the  air  retards  the 
diffusion  of  the  vapor  particles.  It  is  more  correct  to  say,  in  the 
above  cases,  that  the  space  is  partly  saturated  with  moisture,  or 
that  the  moisture  is  in  a  partly  saturated  condition  or  is  super- 
heated. By  all  means  use  the  phrase  '  '  Weight  of  a  cubic  foot  of 
saturated  aqueous  vapor,"  not  "Weight  of  aqueous  vapor  in  a 
cubic  foot  of  saturated  air." 

THE  PSYCHROMETRIC  FORMULA.  —  The  values  of  relative  humid- 
ity, and  the  temperature  of  dew-points  given  in  the  accompanying 
tables,  have  been  computed  by  means  of  the  following  formula, 
deduced  by  Professor  Ferrel,* 


( 


in  which  t  and  t'  are  the  temperatures  of  the  dry  and  wet  bulb 
thermometers,  P  is  the  barometric  pressure  of  the  air  in  inches, 
all  corrections  having  been  applied,  and  e'  is  the  maximum  or  sat- 
uration pressure  of  aqueous  vapor  at  the  temperature  t'  of  the  wet 
bulb. 

The  solution  of  the  equation  gives  e,  the  pressure  of  the  aqueous 
vapor  corresponding  to  the  observed  temperatures  t  and  t'. 

The  constants  of  the  formula  were  deduced  from  a  large  series 
of  experiments  made  by  the  writer  in  Colorado  Springs,  Colo., 
and  at  different  elevations  on  Pike's  Peak.  These  experiments  were 
supplemented  by  similar  observations  made  in  Washington  by 
Prof.  H.  A.  Hazen  and  the  writer,  and  include  a  considerable 
number  of  experiments  at  temperatures  below  the  freezing  point 
by  Professor  Hazen. 

In  the  experiments  referred  to,  the  sling,  or  whirled  psychrome- 
ter,  was  employed  to  ascertain  the  difference,  t  —  t\  between  the 
wet  and  dry  bulb  temperatures,  and  simultaneous  determinations 
were  also  made  of  the  temperature  of  the  dew-point  by  means  of 
modified  forms  of  the  Regnault  and  the  Alluard  dew-point  appara- 
tus. The  modified  Regnault  apparatus  is  described  in  a  preceding 
paragraph  and  shown  in  fig.  2. 

The  formula  and  tables  are,  therefore,  strictly  applicable  only 
to  wet  and  dry  bulb  temperatures  as  determined  by  means  of  the 
sling,  or  whirled  psychrometer,  or  some  equivalent  form  of  appa- 
ratus, in  which  the  wet  bulb  especially  is  subjected  to  a  strong 
current  of  air,  the  velocity  of  which  is  not  less  than  15  feet  per 
second. 

MAXIMUM  PRESSURE  OF  AQUEOUS  VAPOR.  —  The  amount  of 
saturated  aqueous  vapor  that  can  exist  in  any  given  space  depends 
entirely  upon  the  temperature.  It  appears  that  the  vapor  may  be 

*Annual  report  of  the  Chief  Signal  Officer,  1886;  Appendix  24,  pp.  233-259. 


10 

supersaturated  under  certain  peculiar  conditions,  but  this  is  a 
special  and  an  unstable  state  of  nature  which  need  not  be  consid- 
ered in  the  present  connection.  When  the  vapor  is  saturated,  it 
will  exert  a  certain  pressure  which  varies  with  the  temperature 
and  which  so-called  "maximum  pressure "  has  been  measured  with 
greater  or  less  precision  over  a  long  range  of  temperature  from 
about  60°  below  zero  F.  to  far  above  the  boiling  point  of  water. 

The  hygrometric  tables  used  by  the  Weather  Bureau  since  1886 
have  been  based  on  the  formula  given  above  but  used  in  a  slightly 
modified  form.  The  vapor  pressures  employed  were  derived  from 
Broch's  reduction  of  Regnault's  observations.*  All  the  values 
given  by  these  tables  at  temperatures  below  the  freezing  point  are 
noticeably  higher  than  Regnault's  observations.  In  view  of  this 
systematic  discordance,  and  the  further  circumstance  that  Reg- 
nault's experiments  did  not  include  observations  at  the  extremely 
low  temperatures  frequently  recorded  at  Weather  Bureau  stations, 
the  writer,  in  1891,  made  a  new  determination  of  the  maximum 
pressure  of  aqueous  vapor  at  low  temperatures.! 

In  the  course  of  these  experiments  it  was  found  an  easy  matter 
to  reduce  the  temperature  of  the  water  employed  many  degrees 
below  32°  F.,  without  freezing  it,  and  in  these  cases  the  vapor 
pressure  was  higher  than  the  pressure  from  ice  at  the  same  temper- 
ature. Independent  experiments  in  Sweden,  by  Julius  Juhlin, 
at  about  this  time,  led  to  the  same  results. 

A  comparison  of  the  vapor  pressures  derived  from  the  several 
sources  mentioned,  show  that  Broch's  computed  values  at  low  tem- 
peratures do  not  agree  at  all  well  with  Regnault's  experiments, 
from  which  they  are  derived,  whereas  the  experimental  results  of 
Regnault,  Juhlin,  and  the  writer  agree  very  closely. 

At  temperatures  below  32°  F.,  therefore,  it  has  been  considered 
necessary  to  reject  Broch's  values,  and  the  vapor  pressures  over 
ice,  as  deduced  from  the  writer's  experiments,  have  been  used  in 
the  calculation  of  the  following  tables.  These  values  are  given 
in  the  several  columns  headed  "Vapor  pressure,  e."  At  tempera- 
tures above  32°  F.,  the  values  taken  from  Broch's  tables  are  em- 
ployed, and  likewise  recorded  in  the  appropriate  columns  headed 
"Vapor  pressure,  e."  At  32°  F.,  the  value  for  the  vapor  pressure 
found  by  the  writer  from  the  mean  of  a  large  number  of  experi- 
ments, was  identical  with  that  of  Broch ;  hence  there  is  no  break 
in  the  continuity  of  the  two  tables  at  the  point  of  junction. 

The  atmospheric  pressure  at  the  great  majority  of  Weather  Bu- 
reau stations  ranges  from  28  to  31  inches,  and  to  obviate  the  neces- 
sity of  any  correction  for  pressure  or  interpolations  two  tables 

*  Travaux  et  Memoires  du  Bureau  International  des  Poids  et  Mesures,  Tome  I. 
\  Annual  report  of  the  Chief  Signal  Officer,  1891 ;  Appendix  No.  10,  pp.  351-383. 


11 

for  pressures  of  29  inches  and  30  inches,  respectively,  have  been 
computed.  Considerable  portions  of  these  two  tables  are  simply- 
duplicate  impressions  from  the  same  electrotypes,  but  this  duplica- 
tion not  only  secures  accuracy  but  greatly  facilitates  reduction  of 
observation  at  numerous  stations.  Three  additional  tables  at  27, 
25,  and  23  inches,  respectively,  have  been  added  for  the  reduction 
of  observations  at  correspondingly  elevated  stations. 

VAPOR  PRESSURES  AT  HIGH  TEMPERATURES. — Table  XI  is 
added  at  the  end  of  the  series  in  response  to  numerous  requests 
for  tables  giving  relative  humidities  at  high  temperatures,  and 
gives  the  vapor  pressure,  in  inches  of  mercury,  for  each  degree  of 
temperature  from  100°  to  445°  F.  The  values  in  this  table,  up  to 
and  including  212°,  have  been  taken  from  Broch's  tables.  Above 
212°  the  values  are  reproduced  in  English  units  from  Regnault's 
original  tables.*  Broch's  values  have  all  been  reduced  to  standard 
temperature  and  nianometric  units  at  sea  level  and  latitude  45°; 
Regnault's  values  are  for  the  latitude  and  elevation  of  his  labora- 
tory in  Paris,  viz,  48°  50'  14"  north  latitude,  and  60  meters  (197 
feet)  above  the  level  of  the  sea.  There  is  thus  a  slight  discord- 
ance between  the  different  parts  of  the  table,  but  the  effect  is 
very  small. 

The  psychrometric  formula  given  above  can  not  be  used  for  tem- 
peratures higher  than  130°  to  140°  F.,  for  the  reason  that  the  con- 
stants of  the  equation  have  been  deduced  from  experiments  only 
at  ordinary  temperatures,  and  the  use  of  the  formula  for  the 
reductions  of  observations  at  high  temperatures  would  give  only 
coarsely  approximate  results. 

Probably  the  most  available  method  of  determining  humidities 
at  high  temperatures  is  by  use  of  the  dew-point  apparatus  described 
on  page  7,  which  is  susceptible  of  a  great  variety  of  forms,  and 
gives  directly  the  temperature  of  the  dew-point.  Table  XI  then 
gives  the  corresponding  vapor  pressure.  The  relative  humidity 
is  obtained  by  dividing  this  pressure  by  the  pressure  given  in  Table 
XI  corresponding  to  the  air  temperature.  For  example,  suppose 
it  is  found  the  temperature  of  the  dew-point  of  the  air  in  a  drying 
oven  is  115°,  and  that  the  temperature  of  the  air  is  205°.  From 
Table  XI  the  vapor  pressure  at  115°  is  2.975  inches,  and  at  205°  is 
25.99  inches,  hence  the  relative  humidity  is  2.975  -4-  25.99  =  11  per 
cent. 

THE  WEIGHT  OF  AQUEOUS  VAPOR  (ABSOLUTE  HUMIDITY).— 
The  weight  of  a  cubic  foot  of  aqueous  vapor  at  different  temper- 
atures and  percentages  of  saturation  is  sometimes  called  the  abso- 
lute humidity. 

*  Memoires  de  L'Academie  des  Sciences  de  L'lnstitute  de  France,  Tome  XXI, 
1847. 


12 

Saturated  aqueous  vapor  is  but  little  more  than  half  as  heavy  as 
the  same  volume  of  dry  air  under  like  conditions  of  temperature 
and  pressure.  In  all  ordinary  computations  it  is  assumed  that  the 
expansion  and  contraction  of  partially  saturated  aqueous  vapor  is 
in  accordance  with  the  same  laws  as  apply  to  air  and  ordinary 
gases,  which  do  not  easily  condense  to  the  liquid  state. 

The  adopted  density  of  saturated  aqueous  vapor  is  not  deter- 
mined directly  from  experiment,  but  is  deduced  theoretically  from 
the  observed  fact  that  two  volumes  of  hydrogen  and  one  of  oxy- 
gen, combine  to  produce  two  volumes  of  water  vapor. 

The  weights  of  unit  volumes  of  hydrogen,  oxygen,  and  dry  air 
are  accurately  known,  from  which  the  specific  gravity  of  aqueous 
vapor  is  found  to  be  0.6221. 

If  English  units  of  temperature,  pressure,  and  weight  are  used, 
we  find  the  weight  of  a  cubic  foot  of  saturated  aqueous  vapor  in 
grains  is : 

F' 
L1-7449~l  + 0.002037  (*- 32)' 

This  formula  gives  the  weights  found  in  the  column  headed 
"  100  "  in  Table  XII. 

USE    OF   TABLES   EXPLAINED. 

In  reducing  psychrometic  observations,  regard  should  be  had  to 
the  atmospheric  pressure  at  the  time,  and  results  deduced  from 
the  tables  based  on  a  pressure  nearest  that  observed.  Interpola- 
tion for  intermediate  pressures  need  not  be  made,  arid  when  the 
pressure  is  not  observed,  an  approximate  value,  known  to  be 
appropriate  to  the  particular  elevation  of  the  point  of  observation, 
may  be  employed. 

The  psychrometric  observations  made  at  Weather  Bureau  sta- 
tions will  be  reduced  by  means  of  the  tables  based  on  an  air  pres- 
sure which  is  numerically  nearest  the  average  or  normal  station 
pressure,  and  detached  copies  of  appropriate  tables  for  the  several 
stations  will  be  furnished  for  the  convenience  of  observers  in  their 
daily  work. 

The  temperatures  t  and  t'  of  the  wet  and  dry  bulb  thermometers 
will  be  read,  and  the  difference  t  —  t'  computed  to  the  nearest  tenth 
of  a  degree.  It  is  desired  that  the  dew-point  especially  be  taken 
out  to  the  nearest  whole  degree,  and  the  tables  have  been  expanded 
with  a  view  to  obviating  difficult  interpolations.  In  some  cases, 
however,  double  interpolations  must  be  considered,  but  the  proper 
result  can  often  be  obtained  by  simple  inspection.  When  the  air 
is  very  dry,  however,  a  careful  calculation  is  necessary. 


13 

An  examination  of  the  dew-point  tables  especially  will  show 
that  diagonal  lines  exist,  inclining  downward  and  to  the  right, 
along  which  the  tabulated  values  of  the  dew-points  are  constant 
or  change  very  little.  As  a  result  of  this  circumstance,  when  the 
observed  values  of  air  temperature  and  t  —  t'  fall  even  roughly 
midway  between  the  values  given  in  the  arguments  of  the  table, 
double  interpolation  will,  in  general,  not  be  required,  as  the  cor- 
rect result  will  be  obtained  by  dropping  both  intermediate  frac- 
tions, even  where  they  exceed  half  the  interval — that  is,  take  out 
the  dew-point  corresponding  to  the  arguments  next  lower  than  the 
air  temperature  and  t  —  t'  observed. 

When  one  of  the  observed  quantities  is  quite  near  a  tabulated 
value,  the  latter  will  be  used,  and  the  interpolation,  if  any  is 
required,  based  on  the  other  quantity  only. 

When  the  air  is  very  dry  the  successive  values  in  the  table  differ 
so  much  that  carefully  calculated  interpolations  will  often  be 
required. 

The  following  examples  of  the  use  of  the  tables  illustrate  how 
the  foregoing  principles  are  applied : 

EXAMPLE  No.  1.— AIR  PRESSURE,  29.7  INCHES. 

Air  temperature,  £=75.0°. 

Depression  of  the  wet  bulb,  (£-0  =  9.5°. 

In  this  case  the  table  for  30  inches  air  pressure  should  be  used, 
and  we  find  on  page  18,  opposite  75°  in  column  9.5° : 
Dew  point= 60°. 

On  this  same  page,  opposite  60°  under  the  column  e,  we  find : 
Vapor  pressure,  e=0.$17. 

Finally,  on  page  58,  opposit    75°  in  column  9.5°,  we  find: 
Relative  humidity =60  per  cent. 

EXAMPLE  No.  2.— AIR  PRESSURE,  25.8  INCHES. 

Air  temperature,  £=67.8°. 

Depression  of  the  wet  bulb,  (t—f)  =  3. 2°. 

In  this  case  the  table  for  25  inches  on  page  43  must  be  used,  and 
the  tabulated  values  which  must  be  considered  are : 


3.0°. 

3.5'. 

67°  _  

63 

62 

68°  

64 

63 

14 

A  double  interpolation  seems  to  be  required  in  a  case  of  this  kind, 
but  it  will  be  observed  that  if  we  drop  both  the  intermediate  frac- 
tions and  take  the  dew-point  corresponding  to  air  temperature,  67°, 
and  £—£'=3°,  we  get  dew-point  63°,  which  is  the  correct  result  to 
the  nearest  degree.  We  thus  have  for  the  complete  reduction  of 
this  observation : 

Dew-point=63°. 

Vapor  pressure =0.575. 

Relative  humidity— 85  per  cent. 

EXAMPLE  No.  3. 

The  following  example  of  the  use  of  Table  XII  indicates  how 
interpolation  for  intermediate  percentages  of  saturation  may  be 
effected  : 

What  is  the  weight  of  vapor  in  a  cubic  foot  corresponding  to  a 
temperature  of  70°  and  a  relative  humidity  of  83  per  cent? 

At  70°  and  80  per  cent  the  weight  is.. 6.384   grains. 

The  additional  weight  for  3  per  cent  is  TV  the  weight 
for  30  per  cent,  viz _.       .2394  grains. 

Hence,  the  weight  at  70°  and  83  per  cent  is. . _    6. 623   grains. 


[For  additional  notes,  see  Appendix,  page  85.] 


16 


TABLE  I. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  30.0  inches. 


Air 
temp. 
t 

Vapor 
press. 
e 

Depression  of  wet-bulb  thermometer  (t  —  <'). 

.2 

.4 

.6 

.8 

1.0   1.2 

1.4 

1.6 

1.8 

2.0   2.2 

2.4 

2.6 

2.8 

3.0 

—40 
—39 

00 

.0039 
41 

A  A 

—50 

A(\ 

J 

J 

(«-O 

—  Go 

-37 

44 

46 

—  '4y 
-48 

.1 

.2 

.3 

.4 

.5 

—36 

48 

—46 

—35 

.0051 

-45 

-60 

.0010 

-50 

.0021 

-60 

—34 

54 

—43 

—59 

-59 

11 

-49 

22 

-58 

-33 

57 

-42 

-56 

—58 

12 

-48 

24 

—56 

—32 

61 

—40 

—53 

-57 

13 

-47 

26 

-55 

-31 

65 

-38 

-50 

-56 

13 

-46 

27 

-53 

—30 

.0069 

-36 

—47 

-55 

.0015 

-45 

.0029 

-51 

—29 

74 

—35 

—45 

-54 

16 

-44 

31 

—50 

-60 

-28 
-27 
-26 

78 
83 
89 

-33 
-32 
-30 

-42 
-40 
-38 

-58 
-54 
-50 

-53 
-52 
-51 

17 

18 
.0019 

-43 
-42 
-41 

33 
35 
37 

-49 
-48 
-46 

-58 
-56 
-54 

—25 
-24 

.0094 
.0100 

-29 
—28 

—36 
—34 

-46 
—43 

—60 

—40 
-39 

.  0039 
41 

—45 
-44 

—52 
-50 

-23 

106 

-27 

-32 

-40 

-54 

-38 

44 

--43 

-49 

-59 

—22 

112 

—26 

—31 

-38 

-49 

-37 

48 

-42 

-48 

-56 

-21 

119 

-25 

-29 

-35 

-45 

—36 

48 

-41 

-46 

—54 

-20 

.0126 

--23 

-28 

-33 

-42 

-57 

-35 

.0051 

-40 

-45 

-51 

-19 

133 

-22 

—26 

-31 

-39 

-51 

-34 

54 

-38 

-43 

-49 

-59 

—  18 

141 

—21 

—25 

—29 

—36 

—46 

-33 

57 

-37 

-42 

-47 

-56 

-17 

150 

-20 

-23 

-28 

-33 

-42 

-59 

—32 

61 

-35 

-40 

-46 

-53 

-16 

159 

-19 

-22 

-26 

-31 

-38 

-51 

-31 

65 

-34 

-38 

-44 

-50 

-60 

-15 

.0168 

-18 

-21 

-24 

-29 

-35 

-45 

-30 

.0069 

-33 

-36 

-42 

-47 

-56 

-14 

178 

-Ifi 

-19 

-23 

-27 

-32 

-40 

—56 

-13 
-12 

188 
199 

-15 

-14 

-18 
-17 

-21 

-20 

-25 
-23 

-30 

-27 

-36 
-33 

-48 
-43 

-59 

-11 

210 

-13 

-16 

-18 

-22 

-25 

-30 

-38 

-50 

-10 

.0222 

-12 

-14 

-17 

-20 

-24 

-28 

-33 

-44 

-  9 

234 

-11 

-13 

-16 

-18 

-22 

-26 

-30 

-38 

-51 

-  8 

247 

-10 

-12 

-14 

-17 

-20 

-24 

-28 

-34 

-44 

-  7 

260 

-  9 

-11 

-13 

-16 

—18 

-22 

—26 

—31 

-38 

-51 

-  6 

275 

-  8 

-10 

-12 

-14 

-17 

-20 

-23 

-28 

-33 

-44 

-  5 

.0291 

-  7 

-  8 

-10 

-13 

-15 

—18 

-21 

-25 

-30 

-37 

-50 

-  4 

307 

-  6 

-  7 

-  9 

-11 

-14 

-16 

-19 

-22 

-27 

-32 

-42 

-59 

—  3 

325 

-  4 

-  6 

—  8 

-10 

—12 

—14 

-17 

-20 

-24 

-29 

-35 

-47 

-  2 

344 

-  3 

-  5 

-  7 

-  8 

-10 

-13 

-15 

-18 

-21 

-25 

-30 

-38 

-53 

-  1 

363 

-  2 

A 

-  5 

-  7 

—  9 

-11 

-13 

-16 

-19 

-22 

-27 

-32 

-42 

-60 

0 

.0383 

-  1 

-  3 

4 

-  6 

7 

—  9 

-12 

-14 

-17 

-20 

-23 

-28 

-35 

-46 

H  1 

403 

±  0 

-  2 

-  3 

-  4 

-  6 

—  8 

-10 

-12 

-15 

-17 

-20 

-25 

-30 

-37 

-50 

2 

423 

+-  1 

-  1 

-  2 

-  3 

-  5 

-  6 

-  8 

-10 

-13 

-15 

-18 

-21 

-26 

-31 

-40 

3 

444 

2 

+  1 

-  1 

-  2 

A 

-  5 

-  7 

-  9 

-11 

-13 

-16 

-19 

-22 

—27 

-32 

4 

467 

3 

2 

±  0 

-  1 

-  2 

-  4 

-  5 

-  7 

-  9 

-11 

—14 

-16 

-19 

-23 

-28 

5 

.0491 

4 

3 

+  1 

±  0 

-  1 

-  3 

-  4 

-  6 

-  7 

-  9 

-12 

-14 

-17 

-20 

-24 

6 

515 

5 

4 

3 

+  1 

±  0 

-  1 

-  3 

-  4 

-  6 

-  8 

-10 

-12 

-15 

-17 

-21 

7 

542 

6 

5 

4 

2 

+  1 

±  0 

-  1 

—  3 

A 

-  6 

—  8 

-10 

-12 

-15 

-18 

8 

570 

7 

6 

5 

4 

3 

+  1 

±  0 

-  2 

-  3 

-  6 

-  6 

-  8 

-10 

-13 

-15 

9 

600 

8 

7 

6 

5 

4 

3 

+  1 

±  o 

-  2 

—  3 

-  5 

-  6 

—  8 

-10 

-13 

10 

.0631 

9 

8 

7 

6 

5 

4 

3 

+  1 

±  0 

-  2 

-  3 

-  5 

-  6 

-  8 

-10 

11 

665 

10 

9 

8 

7 

6 

5 

4 

3 

+  1 

±  0 

-  1 

-  3 

-  4 

—  6 

Q 

12 

699 

11 

10 

9 

8 

7 

6 

5 

4 

3 

+  2 

±  0 

-  1 

-  3 

-  4 

-  fl 

13 

735 

12 

11 

11 

10 

9 

8 

7 

6 

4 

3 

+  2 

±  o 

-  1 

—  2 

-  4 

14 

772 

13 

12 

12 

11 

10 

9 

8 

7 

6 

5 

3 

+  2 

+  1 

-  I 

-  2 

15 

.0810 

14 

13 

13 

12 

11 

10 

9 

8 

7 

6 

5 

4 

2 

+  1 

±  0 

16 

850 

15 

14 

14 

13 

12 

11 

10 

9 

8 

7 

8 

5 

4 

3 

+  1 

17 

891 

16 

15 

15 

14 

13 

12 

12 

11 

10 

9 

8 

7 

6 

4 

3 

18 

933 

17 

17 

16 

15 

14 

13 

13 

12 

11 

10 

9 

8 

7 

6 

5 

19 

.0979 

18 

18 

17 

16 

15 

15 

14 

13 

12 

11 

10 

9 

8 

7 

6 

20 

.1326 

19 

19 

18 

17 

16 

16 

15 

14 

13 

12 

12 

11 

10 

9 

8 

16 


TABLE  I. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  30.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (<—<')• 

temp, 

i 

3.2 

3.4 

3.6 

3.8 

4.0 

4.2 

4.4 

4.6 

4.8 

5.0 

5.2 

5.4 

5.6 

5.8 

6.0 

2 

-56 

3 

-43 

4 

-34 

-46 

5 

-29 

-36 

-49 

6 

-26 

-30 

-39 

—53 

7 

-21 

-26 

-31 

-41 

-58 

8 

-18 

-22 

-26 

-32 

-42 

9 

-16 

-19 

-22 

-27 

—33 

-44 

10 

-13 

-16 

-19 

-23 

-27 

—34 

-45 

11 

-10 

-13 

-16 

-19 

-22 

-27 

-34 

-46 

12 

-  8 

-10 

-13 

-15 

-19 

-22 

-27 

-34 

-47 

13 

-  6 

g 

—10 

-12 

-15 

-18 

-22 

-27 

-34 

-46 

14 

-  4 

-  6 

-  8 

-10 

-12 

-15 

-18 

-22 

-27 

-33 

-45 

15 

-  2 

-  4 

—  5 

—  7 

-  9 

-12 

-15 

-18 

-21 

-26 

-32 

-44 

16 

±  0 

-  2 

-  3 

-  5 

-  7 

-  9 

-11 

-14 

-17 

-20 

-25 

-31 

-42 

17 

1        0 

±A 

j 

4 

{* 

10 

T  C 

on 

f>A 

on 

QO 

K.T 

18 

•f-    £» 

+  3 

u 
+  2 

+  1 

-  1 

-  2 

-  4 

-  6 

-  8 

-10 

-13 

-16 

-19 

-23 

-29 

-37 

19 

+  5 

+  4 

+  3 

+  1 

±  0 

-  2 

-  4 

-  5 

_  fj 

-10 

-12 

-15 

-18 

-22 

-27 

20 

+  7 

+  6 

+  4 

-f  3 

+  2 

±  o 

-  1 

-  3 

—  5 

—  7 

—  9 

-11 

-14 

-17 

-21 

TABLE  I.  — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  30.0  inches. 


Air 

temp. 

Vapor 
press. 

Depression  of  wet-bulb  thermometer  (t  —  <'). 

t 

e 

0.5 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

5.0 

6.6 

6.0 

6.6 

7.0 

7.5 

20 

0.103 

18 

16 

14 

12 

10 

8 

5 

2 

-2 

-7 

-13 

-21 

-37 

21 

.108 

19 

18 

16 

14 

12 

9 

7 

3 

±0 

—4 

-  9 

-16 

-27 

-60 

22 

.113 

20 

19 

17 

15 

13 

11 

8 

5 

+2 

-2 

-  6 

-12 

-20 

-36 

11  fl 

91 

20 

18 

16 

14 

12 

10 

1 

4 

+0 

4 

9 

16 

26 

57 

23 
24 

.  llo 

.124 

u 
23 

21 

19 

17 

15 

13 

11 

9 

6 

+2 

-  1 

-  6 

-12 

-20 

—35 

25 

0.130 

24 

22 

20 

19 

17 

15 

13 

10 

8 

5 

+  1 

-  3 

-  8 

-15 

-25 

26 

.136 

25 

23 

22 

20 

18 

16 

14 

12 

9 

7 

3 

-  1 

-  5 

-11 

-18 

27 

.143 

26 

24 

23 

21 

19 

18 

16 

13 

11 

8 

5 

+  2 

0 

-  7 

-14 

28 

.150 

27 

25 

24 

22 

21 

19 

17 

15 

13 

10 

7 

4 

db  0 

-  4 

-  9 

29 

.157 

28 

26 

25 

23 

22 

20 

18 

16 

14 

12 

9 

6 

+  3 

-  1 

-  5 

30 

0.164 

29 

27 

26 

25 

23 

21 

20 

18 

16 

14 

11 

8 

5 

•f  2 

-  2 

31 

.172 

30 

28 

27 

26 

24 

23 

21 

19 

17 

15 

13 

10 

8 

4 

±  o 

32 

.180 

31 

30 

28 

27 

25 

24 

22 

21 

19 

17 

15 

12 

10 

7 

+  3 

33 

.187 

32 

31 

29 

28 

27 

25 

24 

22 

20 

18 

16 

14 

12 

9 

6 

34 

.195 

33 

32 

30 

29 

28 

26 

25 

23 

22 

20 

18 

16 

13 

11 

8 

35 

0.203 

34 

33 

31 

30 

29 

28 

26 

25 

23 

81 

19 

17 

15 

13 

10 

36 

.211 

35 

34 

32 

31 

30 

29 

27 

26 

24 

23 

21 

19 

17 

15 

12 

37 

.219 

36 

35 

33 

32 

31 

30 

28 

27 

26 

24 

22 

21 

19 

17 

14 

38 

.228 

37 

36 

34 

33 

32 

31 

29 

28 

27 

25 

24 

22 

20 

18 

16 

89 

.237 

38 

37 

35 

34 

33 

32 

31 

29 

28 

27 

25 

23 

22 

20 

18 

40 

0.247 

39 

38 

37 

35 

34 

33 

32 

30 

29 

28 

26 

25 

23 

21 

20 

41 

.256 

40 

39 

38 

36 

35 

34 

33 

31 

30 

29 

27 

26 

24 

23 

21 

42 

.266 

41 

40 

39 

38 

36 

35 

34 

33 

31 

30 

29 

27 

26 

24 

23 

43 

.277 

42 

41 

40 

39 

37 

36 

35 

34 

O.) 

31 

30 

28 

27 

25 

24 

44 

.287 

43 

42 

41 

40 

38 

37 

36 

35 

34 

32 

31 

30 

28 

27 

25 

45 

0.298 

44 

43 

42 

41 

40 

38 

37 

36 

35 

34 

32 

n 

30 

28 

27 

46 

.310 

45 

44 

43 

42 

41 

40 

38 

37 

36 

35 

33 

& 

31 

29 

28 

47 

.322 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

35 

33 

32 

31 

29 

48 

.334 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

35 

33 

32 

31 

49 

.347 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

34 

33 

32 

50 

0.360 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

34 

33 

61 

.373 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

34 

52 

.387 

51 

60 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

53 

.402 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

54 

.417 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

55 

0.432 

54 

53 

52 

51 

50 

50 

49 

48 

47 

45 

44 

43 

42 

41 

'  40 

56 

.448 

55 

54 

63 

53 

52 

51 

50 

49 

48 

47 

46 

44 

43 

42 

41 

57 

.465 

56 

55 

64 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

43 

42 

58 

.482 

57 

56 

65 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

69 

.499 

58 

57 

56 

56 

55 

54 

53 

52 

51 

50 

49- 

48 

47 

46 

45 

60 

0.517 

59 

58 

57 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

61 

.536 

60 

59 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

62 

.555 

61 

60 

60 

59 

58 

57 

56 

55 

54 

53 

53 

52 

61 

50 

48 

63 

.575 

62 

61 

61 

60 

59 

58 

57 

56 

55 

55 

54 

53 

52 

51 

50 

64 

.595 

63 

62 

62 

61 

60 

59 

58 

57 

57 

56 

55 

54 

53 

52 

51 

66 

0.616 

64 

63 

63 

62 

61 

60 

59 

59 

58 

57 

56 

55 

54 

53 

52 

66 

.638 

65 

64 

64 

63 

62 

61 

60 

60 

59 

58 

67 

56 

55 

54 

53 

67 

.661 

66 

65 

65 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

55 

54 

68 

.684 

67 

67 

66 

65 

64 

63 

63 

62 

61 

60 

59 

58 

57 

57 

56 

69 

.707 

68 

68 

67 

66 

65 

64 

64 

63 

62 

61 

60 

59 

59 

58 

57 

70 

0.732 

69 

69 

68 

67 

66 

65 

65 

64 

63 

62 

61 

61 

60 

59 

58 

71 

.757 

70 

70 

69 

68 

67 

67 

66 

65 

64 

63 

62 

62 

61 

60 

59 

72 

.783 

71 

71 

70 

69 

68 

68 

67 

66 

65 

64 

64 

63 

62 

61 

60 

73 

.810 

72 

72 

71 

70 

69 

69 

68 

67 

66 

66 

65 

64 

63 

62 

61 

74 

.838 

73 

73 

72 

71 

70 

70 

69 

68 

67 

67 

66 

65 

64 

63 

62 

75 

0  866 

74 

74 

73 

72 

71 

71 

70 

69 

68 

68 

67 

66 

65 

64 

64 

76 

.896 

75 

75 

74 

73 

72 

72 

71 

70 

69 

69 

68 

67 

66 

66 

66 

77 

.926 

76 

76 

75 

74 

73 

73 

72 

71 

71 

70 

69 

68 

67 

67 

66 

78 

.957 

77 

77 

76 

75 

75 

74 

73 

72 

72 

71 

70 

69 

69 

68 

67 

79 

0.989 

78 

78 

77 

76 

76 

75 

74 

73 

73 

72 

71 

70 

70 

69 

68 

80 

1.  022 

79 

79 

78 

77 

77 

76 

75 

74 

74 

73 

72 

72 

71 

70 

69 

9181  °— li 


TABLE  I. — Temperature  of  dew-point  in  degrees  Fahrenheit. 


Pressure  =  30.0  inches. 


Air 
temp. 
t 

Vapor 
press. 
e 

Depression  of  wet-bulb  thermometer  (t  —  <'). 

8.0 

8.5 

9.0 

9.5 

10.0 

10.5 

11.0 

11.5 

12.0 

12.5 

13.0' 

13.5 

14.0 

14.5 

15.0 

25 

0.130 

-51 

26 

.136 

-32 

27 

.143 

-23 

-45 

28 

.150 

-17 

-29 

29 

.157 

-12 

-20 

-39 

30 

0.164 

»T 

-14 

-25 

-57 

31 

.172 

-  4 

-10 

-18 

-31 

-—32 

.180 

-  1 

-  6 

-12 

-21 

-42 

33 

.187 

4  2 

-  2 

-  7 

-14 

-26 

34 

.195 

5 

+  1 

-  3 

-  9 

-17 

-32 

35 

0.203 

7 

4 

±  0 

-  5 

-11 

-20 

-41 

36 

.211 

10 

7 

+  3 

-  1 

-  6 

-14 

-as 

-58 

37 

.219 

12 

9 

6 

+  2 

-  3 

-  8 

-16 

-29 

38 

.228 

14 

11 

8 

5 

+  I- 

—  4 

-10 

-19 

-36 

39^ 

.237 

16 

13 

11 

8 

4 

±  0 

-  5 

-12 

-22 

-47 

—  40 

\0.  247 

18 

15 

13 

10 

7 

+  3 

1 

-  6 

-14 

-26 

41 

.256 

19 

17 

15 

12 

10 

6 

+  2 

-  2 

-  8 

-16 

-30 

42 

,266 

21 

19 

17 

14 

12 

9 

6 

+  2 

-  3 

-  9 

-18 

-36 

43 

.277 

'22 

20 

19 

16 

14 

11 

9 

5 

+  1 

-  4 

-11 

-21 

-45 

44 

.287 

24 

22 

20 

18 

16 

13 

11 

8 

4 

+  0 

-  5 

-12 

-24 

-CO 

45 

0.298 

25 

23 

22 

20 

18 

15 

13 

10 

7 

+  4 

-  1 

-  6 

-14 

-27 

46 

.310 

27 

25 

23 

O1 

20 

17 

15 

13 

10 

7 

+  3 

-  2 

-  7 

-16 

-30 

47 

.  3'22 

28 

26 

25 

23 

21 

19 

17 

15 

12 

9 

6 

+  2 

—  3 

-  9 

-17 

-  48 

.334 

29 

28 

26 

25 

23 

21 

19 

17 

14 

12 

9 

5 

+  1 

-  4 

—10 

49 

.347 

30 

29 

28 

26 

24 

23 

21 

19 

16 

14 

11 

8 

5 

±  c 

-  5 

50 

0.360 

32 

30 

29 

27 

26 

24 

22 

21 

18 

16 

13 

11 

8 

+  4 

i  fl 

51 

.373 

33 

32 

30 

29 

27 

26 

24 

22 

20 

18 

16 

13 

10 

7 

+  3 

52 

.387 

34 

33 

32 

30 

29 

27 

26 

24 

22 

20 

18 

16 

13 

10 

7 

53 

.402 

36 

34 

89 

32 

30 

29 

27 

26 

24 

22 

20 

18 

15 

13 

10 

54 

.417 

37 

36 

34 

33 

3'2 

30 

29 

27 

25 

24 

22 

20 

18 

15 

12 

55 

0.  432 

38 

37 

36 

34 

33 

32 

30 

29 

27 

25 

24 

22 

20 

17 

15 

—  56 

.448 

40 

39 

37 

36 

34 

33 

32 

30 

29 

27 

25 

24 

22 

19 

17 

57 

.465 

41 

40 

39 

37 

36 

34 

33 

32 

30 

29 

27 

25 

24 

21 

19 

58 

.482 

42 

41 

40 

39 

37 

36 

35 

33 

32 

30 

29 

27 

25 

23 

21 

59 

.499 

44 

43 

41 

40 

39 

37 

36 

35 

33 

32 

30 

29 

27 

25 

23 

CO 

0.5ft 

45 

44 

43 

41 

40 

39 

38 

36 

35 

33 

32 

30 

29 

27 

25 

61 

.536 

46 

45 

44 

43 

42 

40 

39 

38 

36 

35 

33 

32 

30 

29 

27 

62 

.555 

47 

46 

45 

44 

43 

42 

40 

3& 

38 

36 

35 

33 

32 

30 

29 

63 

.575 

49 

48 

47 

45 

44 

43 

42 

41 

39 

38 

36 

35 

34 

32 

30 

—  64 

.595 

50 

49 

48 

47 

40 

44 

43 

42 

41 

39 

38 

37 

35 

34 

32 

65 

0.616 

51 

50 

49 

48 

47 

46 

45 

43 

42 

41 

40 

38 

37 

35 

34 

66 

.638 

52 

51 

50 

49 

48 

47 

46 

45 

44 

42 

41 

40 

38 

37 

35 

67 

.661 

53 

53 

52 

60 

49 

48 

47 

46 

45 

44 

43 

41 

40 

38 

37 

68 

.684 

55 

54 

53 

52 

51 

50 

49 

48 

46 

45 

44 

43 

42 

40 

39 

69 

.707 

56 

55 

54 

53 

52 

51 

50 

49  ' 

48 

46 

45 

44 

43 

42 

40 

70 

0.732 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

44 

43 

42 

71 

.757 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

43 

—  72 

.783 

59 

58 

58 

57 

56 

55 

54 

53 

52 

51 

50 

48 

47 

46 

45 

73 

.810 

60 

60 

59 

58 

57 

5(5 

55 

54 

53 

52 

51 

50 

49 

48 

46 

74 

.838 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

.75 

0.866 

63 

62 

Gl 

60 

59 

58 

57 

56 

55 

55 

54 

52 

51 

50 

49 

76 

.896 

64 

63 

62 

61 

60 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

77 

.926 

65 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

78 

.957 

66 

65 

64 

64 

03 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

79 

0.989 

67 

66 

66 

65 

64 

63 

62 

61 

60 

59 

59 

58 

57 

5G 

55 

—  80 

1.022 

68 

68 

67 

66 

65 

64 

63 

63 

62 

61 

60 

59 

58 

57 

56 

19 


TABLE  I. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  30.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (I—  I'). 

tcrop. 

15.5 

16.0 

16.5 

17  0 

17.5 

18.0 

18.5 

19.0 

19.5 

20.0 

20.5 

21.0 

21.5 

91  0 

22.5 

47 

—35 

48 

-'20 

-41 

49 

-12 

-22 

-53 

50 

-  6 

-13 

-26 

51 

-  1 

-  7 

-15 

-29 

52 

+  3 

-  2 

-  8 

—17 

—33 

53 

7 

+  2 

-  3 

-  9 

-18 

-39 

54 

10 

(\ 

+  2 

-  4 

-10 

-20 

-47 

65 

12 

9 

6 

+  1 

-  4 

-12 

-23 

-59 

56 

15 

12 

9 

5 

+  1 

-  5 

—  13 

-25 

57 

17 

14 

12 

9 

5 

±  0 

-  6 

-14 

-27 

58 

19 

17 

14 

11 

8 

+  4 

-  1 

—  6 

—15 

-30 

59 

21 

19 

17 

1-1 

11 

8 

+  4 

-  1 

-  7 

--16 

-33 

60 

23 

21 

19 

17 

14 

11 

8 

+  4 

-  2 

-—  8 

-17 

-36 

61 

25 

23 

21 

19 

17 

14 

11 

8 

+  3 

n 

-  8 

-18 

-40 

62 

27 

25 

23 

21 

19 

16 

14 

11 

7 

-*•  3 

-  2 

-  9 

-19   -45 

63 

29 

27 

25 

23 

21 

19 

17 

14 

11 

7 

+  3 

-  2 

-  9   -20 

-49 

64 

31 

29 

27 

25 

23 

21 

19 

17 

14 

11 

7 

+  3 

-  3   -10 

-21 

65 

32 

31 

29 

27 

25 

24 

21 

19 

17 

14 

11 

7 

+  3 

-  3 

-10 

66 

34 

32 

31 

29 

27 

26 

24 

22 

19 

17 

14 

11 

7 

+  2 

-  3 

67 

36 

34 

32 

31 

29 

28 

26 

24 

22 

19 

17 

14 

11 

7 

+  2 

68 

37 

36 

34 

33 

31 

29 

28 

26 

24 

22 

19 

17 

14 

11 

7 

69 

39 

37 

36 

34 

33 

31 

30 

28 

26 

24 

22 

19 

17 

14 

11 

70 

40 

39 

38 

36 

34 

33 

31 

30 

28 

26 

24 

22 

20 

17 

14 

71 

42 

41 

39 

38 

36 

35 

33 

31 

30 

28 

26 

24 

22 

20 

17 

72 

44 

42 

41 

40 

38 

37 

35 

33 

32 

30 

28 

26 

24 

22 

20 

73 

45 

44 

43 

41 

40 

38 

.  37 

35 

34 

32 

30 

28 

27 

25 

22 

74 

47 

45 

44 

$ 

41 

40 

39 

37 

35 

34 

32 

30 

29 

27 

25 

75 

48 

47 

46 

44 

43 

42 

40 

39 

37 

36 

34 

32 

31 

29 

27 

76 

49 

48 

47 

46 

45 

43 

42 

41 

39 

38 

36 

34 

33 

31 

29 

77 

51 

50 

49 

18 

46 

45 

44 

42 

41 

39 

38 

36 

35 

33 

31 

78 

52 

51 

50 

19 

48 

46 

45 

44 

43 

41 

40 

38 

37 

35 

33 

79 

54 

53 

52 

50 

-19 

48 

47 

46 

44 

43 

42 

40 

38 

37 

35 

80 

55 

54 

53 

52 

51 

50 

48 

47 

46 

44 

43 

42 

40 

39 

37 

Depression  of  wet-bulb  thermometer  (<—£'). 

23.0 

23.5 

24.0 

24.5 

25.0 

25.5 

26.0 

26.5 

27.0 

27.5 

28.0 

28.5 

29.0 

29.5 

30.0 

64 

-54 

65 

-22 

66 

-11 

-22 

67 

-  3 

-11 

-23 

68 

+  2 

—  3 

-11 

-24 

69 

7 

+  2 

t  o 

-11 

^)A 

70 

11 

7 

+  2 

-  3 

-11 

-24 

71 

14 

11 

7 

+  3 

-  3 

-11 

-24 

72 

17 

14 

11 

7 

+  3 

-  3 

—11 

-24 

73 

20 

17 

15 

11 

8 

+  3 

-  3 

-11 

-24 

74 

23 

20 

18 

15 

12 

8 

+  3 

-  3 

-10 

-24 

75 

25 

23 

21 

18 

15 

12 

8 

+  4 

-  2 

-10 

-23 

76 

27 

25 

23 

21 

18 

15 

12 

8 

+  4 

-  2 

—10 

22 

77 

29 

28 

26 

23 

21 

18 

16 

13 

9 

+  4 

-  2 

-  9 

-21 

78 

31 

30 

28 

26 

24 

21 

19 

16 

13 

9 

+  6 

-  1 

—  9 

-20 

79 

34 

32 

30 

28 

26 

24 

22 

19 

16 

13 

10 

+  5 

-  1 

—  8 

-20 

80 

36 

34 

32 

30 

28 

26 

24 

22 

20 

17 

13 

10 

+  6 

±  0 

-  7 

TABLE  I.— Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure=30.0  inches. 


Air 
temp. 

Vapor 

press. 

Depression  of  wet-bulb  thermometer  (t  —  <'). 

t 

e 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

80 

1.022 

79 

77 

76 

74 

73 

72 

70 

68 

67 

65 

63 

62 

60 

58 

56 

81 

.056 

80 

78 

77 

75 

74 

73 

71 

70 

68 

66 

65 

63 

61 

59 

57 

82 

.091 

81 

79 

78 

77 

75 

74 

72 

71 

69 

67 

66 

64 

62 

60 

59 

83 

.127 

82 

80 

79 

78 

76 

75 

73 

72 

70 

69 

67 

65 

64 

62 

60 

84 

.163 

83 

81 

80 

79 

77 

76 

74 

73 

71 

70 

68 

66 

65 

63 

61 

85 

1.201 

84 

82 

81 

80 

78 

77 

75 

74 

72 

71 

69 

68 

66 

64 

62 

86 

.241 

85 

83 

82 

81 

79 

78 

76 

75 

73 

72 

70 

69 

67 

65 

64r 

87 

.281 

86 

84 

83 

82 

80 

79 

78 

76 

75 

73 

72 

70 

68 

67 

65 

—  88 

.322 

87 

85 

84 

83 

81 

80 

79 

77 

76 

74 

73 

71 

69 

68 

66 

89 

.364 

88 

86 

85 

84 

82 

81 

80 

78 

77 

75 

74 

72 

71 

69 

67 

90 

1.408 

89 

87 

86 

85 

83 

82 

81 

79 

78 

76 

75 

73 

72 

70 

69 

91 

.453 

90 

88 

87 

86 

85 

83 

82 

80 

79 

78 

76 

75 

73 

71 

70 

92 

.499 

91 

89 

88 

87 

86 

84 

83 

81 

80 

79 

77 

76 

74 

73 

71 

93 

.546 

92 

90 

89 

88 

87 

85 

84 

83 

81 

80 

78 

77 

75 

74 

72 

94 

.595 

93 

92 

90 

89 

88 

86 

85 

84 

82 

81 

79 

78 

76 

75 

73 

95 

1.645 

94 

93 

91 

90 

89 

87 

86 

85 

83 

82 

80 

79 

78 

76 

74 

—  96 

.696 

95 

94 

92 

91 

90 

88 

87 

86 

84 

83 

82 

80 

79 

77 

76 

97 

.749 

96 

95 

93 

92 

91 

89 

88 

87 

85 

84 

83 

81 

80 

78 

77 

98 

.803 

97 

96 

94 

93 

92 

90 

89 

88 

87 

85 

84 

82 

81 

79 

78 

99 

.859 

98 

97 

95 

94 

93 

92 

90 

89 

88 

86 

85 

83 

82 

81 

79 

100 

1.916 

99 

98 

96 

95 

94 

93 

91 

90 

89 

87 

86 

85 

83 

82 

80 

101 

1.975 

100 

99 

97 

96 

95 

94 

92 

91 

90 

88 

87 

86 

84 

83 

81 

102 

2.035 

101 

100 

98 

97 

96 

95 

93 

92 

91 

89 

88 

87 

85 

84 

83 

103 

.097 

102 

101 

99 

98 

97 

96 

94 

93 

92 

91 

89 

88 

86 

85 

84 

104 

.160 

103 

102 

IOC 

99 

98 

97 

95 

94 

93 

92 

90 

89 

88 

86 

85 

105 

2.225 

104 

103 

101 

100 

99 

-  98 

96 

95 

94 

93 

91 

90 

89 

87 

86 

106 

.292 

105 

104 

102 

101 

100 

99 

.  98 

96 

95 

94 

92 

91 

90 

88 

87 

107 

.360 

106 

105 

103 

102 

101 

100 

99 

97 

96 

95 

93 

92 

91 

90 

88 

108 

.431 

107 

106 

104 

103 

102 

101 

100 

98 

97 

96 

95 

93 

92 

91 

89 

109 

.503 

108 

107 

105 

104 

103 

102 

101 

99 

98 

97 

96 

94 

93 

92 

90 

110 

2.576 

109 

108 

106 

105 

104 

103 

102 

100 

99 

98 

97 

95 

94 

93 

91 

111 

.652 

110 

109 

108 

106 

105 

104 

103 

102 

100 

99 

98 

96 

95 

94 

93 

112 

.  730 

lit 

110 

109 

107 

106 

105 

104 

103 

101 

100 

99 

98 

96 

95 

94 

113 

.810 

112 

111 

110 

108 

107 

106 

105 

104 

102 

101 

100 

99 

97 

96 

95 

114 

.891 

113 

112 

111 

109 

108 

107 

106 

105 

103 

102 

101 

100 

98 

97 

96 

115 

2.975 

114 

113 

112 

110 

109 

108 

107 

106 

104 

103 

102 

101 

99 

98 

97 

116 

3.061 

115 

114 

113 

111 

110 

109 

108 

107 

105 

104 

103 

102 

101 

99 

98 

117 

.148 

116 

115 

114 

112 

111 

110 

109 

108 

107 

105 

104 

103 

102 

100 

99 

118 

.239 

117 

116 

115 

113 

112 

111 

110 

109 

108 

106 

105 

104 

103 

101 

100 

119 

.331 

118 

117 

116 

114 

113 

112 

111 

110 

109 

107 

106 

105 

104 

102 

101 

120 

3.425 

119 

118 

117 

115 

114 

113 

112 

111 

110 

108 

107 

106 

105 

104 

102 

121 

.522 

120 

119 

118 

116 

115 

114 

113 

112 

111 

109 

108 

107 

106 

10.-) 

103 

122 

.621 

121 

120 

119 

118 

116 

115 

114 

113 

112 

110 

109 

108 

107 

106 

104 

123 

.723 

122 

121 

120 

119 

117 

116 

115 

114 

113 

112 

110 

109 

108 

107 

106 

124 

.827 

123 

122 

121 

120 

118 

117 

116 

115 

114 

113 

111 

110 

109 

108 

107 

125 

3.933 

124 

123 

122 

121 

119 

118 

117 

116 

115 

114 

112 

111 

no 

109 

108 

126 

4.042 

125 

124 

123 

122 

120 

119 

118 

117 

116 

115 

113 

112 

in 

110 

109 

127 

.154 

126 

125 

124 

123 

121 

120 

119 

118 

117 

116 

114 

113 

112 

111 

110 

128 

.268 

127 

126 

125 

124 

122 

121 

120 

119 

118 

117 

116 

114 

113 

112 

111 

129 

.385 

128 

127 

126 

125 

123 

122 

121 

120 

119 

118 

117 

115 

114 

113 

112 

130 

4.504 

129 

128 

127 

126 

124 

123 

122 

121 

120 

119 

118 

116 

115 

114 

113 

131 

.627 

130 

129 

128 

127 

125 

124 

123 

122 

121 

120 

119 

117 

116 

115 

114 

132 

.752 

131 

130 

129 

128 

126 

125 

124 

123 

122 

121 

120 

119 

117 

116 

115 

133 

4.880 

132 

131 

130 

129 

1-27 

126 

125 

124 

123 

122 

121 

120 

118 

117 

116 

134 

5.011 

133 

132 

131 

130 

129 

127 

126 

125 

124 

123 

122 

121 

119 

118 

117 

135 

5.  145 

134 

133 

132 

131 

130 

128 

127 

126 

125 

124 

123 

122 

120 

119 

118 

136 

.282 

135 

134 

133 

132 

131 

129 

128 

127 

126 

125 

124 

123 

122 

120 

119 

137 

.422 

136 

135 

134 

133 

if* 

130 

129 

128 

127 

126 

125 

124 

123 

121 

120 

138 

.566 

137 

136 

135 

134 

133 

131 

130 

129 

128 

127 

126 

125 

124 

122 

121 

139 

.712 

138 

137 

136 

135 

134 

132 

131 

130 

129 

128 

127 

126 

125 

123 

132 

140 

5.862 

139 

138 

137 

136 

135 

133 

132 

131 

130 

129 

128 

» 

126 

124 

123 

21 


TABLE  I. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  30.0  inches. 


Air 
temp. 
I 

Vapor 
press. 

e 

Depression  of  wet-bulb  thermometer  (t  —  tf). 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

80 

1.022 

54 

52 

50 

47 

44 

42 

39 

36 

32 

28 

24 

20 

13 

6 

-7 

81 

.056 

55 

53 

51 

49 

46 

43 

41 

38 

34 

31 

27 

22 

17 

10 

±0 

82 

.091 

57 

55 

52 

50 

48 

45 

42 

39 

36 

33 

29 

25 

20 

14 

+7 

83 

.127 

58 

56 

54 

52 

49 

47 

44 

41 

38 

35 

31 

27 

23 

18 

11 

84 

.163 

59 

57 

55 

53 

61 

48 

46 

43 

40 

37 

34 

30 

26 

21 

15 

85 

1.201 

61 

59 

57 

54 

52 

50 

48 

45 

42 

39 

36 

32 

28 

24 

19 

86 

.241 

62 

60 

58 

56 

54 

52 

49 

47 

44 

41 

38 

34 

31 

27 

22 

87 

.281 

63 

61 

59 

57 

55 

53 

51 

48 

46 

43 

40 

36 

33 

29 

25 

88 

.322 

64 

62 

61 

59 

57 

55 

52 

50 

47 

45 

42 

38 

35 

31 

27 

89 

.364 

66 

64 

62 

60 

58 

56 

54 

51 

49 

46 

44 

41 

37 

34 

30 

90 

1.408 

67 

65 

63 

61 

59 

57 

55 

53 

51 

48 

45 

43 

39 

36 

32 

91 

.453 

68 

66 

65 

63 

61 

59 

57 

55 

62 

50 

47 

44 

41 

38 

35 

92 

.49!) 

69 

68 

66 

64 

62 

60 

58 

56 

54 

51 

49 

46 

43 

40 

37 

93 

.546 

71 

69 

67 

65 

63 

62 

60 

58 

55 

53 

61 

48 

45 

42 

39 

94 

.596 

72 

70 

68 

67 

65 

63 

61 

59 

57 

55 

52 

50 

47 

44 

41 

95 

1.645 

73 

71 

70 

68 

66 

64 

62 

60 

58 

56 

FA 

52 

49 

46 

43 

96 

.696 

74 

72 

71 

69 

67 

66 

64 

62 

60 

58 

55 

53 

51 

48 

46 

J7 

.749 

75 

74 

72 

70 

69 

67 

65 

63 

61 

59 

57 

55 

52 

60 

47 

98 

.803 

76 

75 

73 

72 

70 

68 

66 

64 

63 

61 

58 

56 

54 

62 

49 

99 

.859 

78 

76 

74 

73 

71 

69 

68 

66 

64 

62 

60 

58 

56 

63 

51 

100 

1.916 

79 

77 

76 

74 

72 

71 

69 

67 

65 

63 

61 

59 

67 

55 

52 

101 

1.975 

80 

78 

77 

75 

74 

72 

70 

69 

67 

65 

63 

61 

59 

66 

54 

102 

2.035 

81 

80 

78 

76 

75 

73 

72 

70 

68 

66 

64 

62 

60 

68  1   56 

103 

.097 

82 

81 

79 

78 

76 

74 

73 

71 

69 

68 

66 

64 

62 

60    57 

104 

.160 

83 

82 

80 

79 

77 

76 

74 

72 

7.1 

69 

67 

65 

63 

61    59 

105 

2.  225 

84 

83 

82 

80 

78 

77 

75 

74 

72 

70 

68 

67 

65 

63    61 

106 

.292 

86 

84 

83 

81 

80 

78 

77 

75 

73 

72 

70 

68 

66 

64 

62 

107 

.360 

87 

85 

84 

82 

81 

79 

78 

76 

75 

73 

71 

69 

67 

66 

64 

108 

.431 

88 

86 

85 

84 

82 

81 

79 

77 

76 

74 

72 

71 

69 

67 

65 

109 

.503 

89 

88 

86 

85 

83 

82 

80 

79 

77 

75 

74 

72 

70 

68 

66 

110 

2.576 

90 

89 

87 

86 

84 

83 

81 

80 

78 

77 

75 

73 

72 

70 

68 

111 

.652 

91 

90 

88 

87 

86 

84 

83 

81 

80 

78 

76 

75 

73 

71 

69 

112 

.730 

92 

91 

90 

88 

87 

85 

84 

82 

81 

79 

78 

76 

74 

72 

71 

113 

.810 

93 

92 

91 

89 

88 

86 

85 

84 

82 

80 

79 

77 

76 

74 

72 

114 

.891 

94 

93 

92 

90 

89 

88 

86 

85 

83 

82 

80 

79 

77 

75 

73 

115 

2.975 

96 

94 

93 

92 

90 

89 

87 

86 

84 

83 

81 

80 

78 

76 

75 

116 

3.061 

97 

95 

94 

93 

91 

90 

88 

87 

86 

84 

83 

81 

79 

78 

76 

117 

.148 

98 

96 

95 

94 

92 

91 

90 

88 

87 

85 

84 

82 

81 

79 

77 

118 

.239 

99 

98 

96 

95 

94 

92 

91 

89 

88 

86 

85 

84 

82 

80 

79 

119 

.331 

100 

99 

97 

96 

95 

9r 

92 

91 

89 

88 

86 

85 

83 

82 

80 

120 

3.425 

101 

100 

98 

97 

96 

94 

93 

92 

90 

89 

87 

86 

84 

83 

81 

121 

.522 

102 

101 

100 

98 

97 

96 

94 

93 

91 

90 

89 

87 

86 

84 

83 

122 

.621 

103 

102 

101 

99 

98 

97 

95 

94 

93 

91 

90 

88 

87 

85 

84 

123 

.723 

1U4 

103 

102 

100 

99 

98 

96 

95 

94 

92 

91 

90 

88 

87 

85 

124 

.827 

105 

104 

103 

102 

100 

99 

98 

96 

95 

94 

92 

91 

89 

88 

86 

125 

3.  933 

106 

105 

104 

103 

101 

100 

99 

97 

96 

95 

93 

92 

90 

89 

88 

126 

4.  0*2 

107 

106 

105 

104 

102 

101 

100 

99 

97 

96 

94 

93 

92 

90 

89 

127 

.lot 

109 

107 

106 

105 

104 

102 

101 

100 

98 

97 

96 

94 

93 

91 

90 

128 

.268 

110 

108 

107 

106 

105 

103 

102 

101 

99 

98 

97 

95 

94 

93 

91 

129 

.  385 

111 

109 

108 

107 

106 

104 

103 

102 

101 

99 

98 

97 

95 

94 

92 

130 

4.504 

112 

110 

109 

108 

107 

106 

104 

103 

102 

100 

99 

98 

96 

95 

94 

131 

.627 

113 

112 

110 

109 

108 

107 

105 

104 

103 

101 

100 

99 

97 

96 

95 

132 

.752 

114 

113 

111 

110 

109 

108 

106 

105 

104 

103 

101 

100 

99 

97 

96 

133 

.880 

115 

114 

112 

111 

110 

109 

108 

106 

105 

104 

102 

101 

100 

98 

97 

134 

5.011 

116 

115 

114 

112 

111 

110 

109 

107 

106 

105 

104 

102 

101 

100 

98 

135 

5.145 

117 

116 

115 

113 

112 

111 

110 

108 

107 

106 

105 

103 

102 

101 

99 

136 

.282 

118 

117 

116 

114 

113 

112 

111 

110 

108 

107 

106 

104 

103 

102 

101 

137 

.422 

119 

118 

117 

116 

114 

113 

112 

111 

109 

108 

107 

106 

104 

103 

102 

138 

.565 

120 

119 

118 

117 

115 

114 

113 

112 

110 

109 

108 

107 

105 

104 

102 

139 

.712 

121 

120 

119 

118 

116 

115 

114 

113 

112 

110 

109 

108 

107 

105 

104 

140 

5.862 

122 

121 

120 

119 

117 

116 

115 

114 

113 

111 

110 

109 

108 

106 

105 

22 


TABLE  I. — Temperature  of  dew-point  in  degrees  Fahrenheit. 


Pressure  =  30. 0  inches. 


Air 

temp. 

Vapor 
press. 

Depression  of  wet-bulb  thermometer  (t--f). 

t 

t 

31 

32 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

80 

1.022 

-53 

81 

.056 

-18 

82 

.091 

-  6 

—43 

83 

.127 

+  2 

-15 

84 

.163 

8 

-  4 

-33 

85 

1.201 

12 

+  3 

-12 

86 

.241 

16 

9 

-  2 

-27 

87 

.281 

20 

13 

+  5 

-10 

88 

.322 

23 

17 

10 

4-  0 

-22 

89 

.364 

26 

21 

15 

+  6 

-  7 

90 

1.408 

28 

24 

19 

11 

+  1 

-17 

91 

.453 

31 

27 

22 

16 

8 

—  4 

-40 

92 

.499 

33 

29 

25 

20 

13 

+  4 

-13 

93 

.546 

36 

32 

28 

23 

17 

10 

-  2 

-28 

94 

.595 

38 

34 

30 

26 

21 

14 

+  6 

—  9 

95 

1.645 

40 

37 

33 

29 

24 

19 

11 

+  1 

-20 

96 

.696 

42 

39 

35 

31 

27 

22 

16 

8 

-  5 

97 

.749 

44 

41 

38 

34 

30 

25 

20 

13 

+  3 

-15 

98 

.803 

46 

43 

40 

36 

32 

28 

23 

17 

10 

-  2 

-33 

99 

.859 

48 

45 

42 

39 

35 

31 

26 

21 

15 

+  6 

-10 

100 

1.916 

50 

47 

44 

41 

37 

33 

29 

25 

19 

12 

+  1 

-22 

101 

1.975 

52 

49 

46 

43 

40 

36 

32 

28 

23 

17 

8 

-  5 

102 

2.  035 

53 

51 

48 

45 

42 

38 

35 

31 

26 

21 

14 

+  4 

-14 

103 

.097 

55 

53 

50 

47 

44 

41 

37 

33 

29 

24 

18 

11 

-  2 

-32 

104 

.160 

57 

54 

52 

49 

46 

43 

40 

36 

32 

27 

22 

16 

+  7 

-  9 

105 

2.225 

58 

56 

54 

51 

48 

45 

42 

38 

34 

30 

26 

20 

13 

+  2 

-2G 

106 

.292 

60 

58 

55 

53 

50 

47 

44 

41 

37 

33 

29 

24 

18 

9 

-  4 

107 

.360 

62 

59 

57 

55 

52 

49 

46 

43 

40 

36 

32 

27 

22 

15 

+  5 

108 

.431 

63 

61 

59 

56 

54 

51 

48 

45 

42 

39 

35 

30 

25 

20 

12 

109 

.503 

64 

62 

60 

58 

56 

53 

50 

47 

44 

41 

37 

33 

29 

23 

17 

110 

2.576 

66 

64 

62 

60 

57 

55 

52 

50 

47 

43 

40 

36 

32 

27 

21 

111 

.652 

67 

65 

63 

61 

59 

57 

54 

52 

49 

46 

42 

39 

35 

30 

25 

112 

.730 

69 

67 

65 

63 

61 

58 

56 

54 

51 

48 

45 

41 

37 

33 

29 

113 

.810 

70 

68 

66 

64 

62 

60 

58 

55 

53 

50 

47 

44 

40 

36 

32 

114 

.891 

72 

70 

68 

66 

64 

62 

59 

57 

55 

52 

49 

46 

43 

39 

35 

115 

2.975 

73 

71 

69 

67 

65 

63 

61 

59 

56 

54 

51 

48 

45 

42 

38 

116 

3.  061 

74 

73 

71 

69 

67 

65 

63 

60 

58 

56 

53 

50 

47 

44 

40 

117 

.148 

76 

74 

72 

70 

68 

66 

64 

62 

60 

58 

55 

52 

49 

46 

43 

118 

.  239 

77 

75 

74 

72 

70 

68 

66 

64 

62 

59 

57 

54 

51 

49 

45 

119 

.331 

78 

77 

75 

73 

71 

69 

67 

65 

63 

61 

59 

56 

53 

51 

48 

120 

3.425 

80 

78 

76 

75 

73 

71 

69 

67 

65 

63 

60 

58 

55 

53 

50 

121 

.522 

81 

79 

78 

76 

74 

72 

70 

68 

66 

64 

62 

60 

57 

55 

52 

122 

.621 

82 

81 

7'J 

77 

76 

74 

72 

70 

68 

66 

64 

62 

59 

57 

54 

123 

.723 

84 

82 

80 

79 

77 

75 

73 

71 

69 

67 

65 

63 

61 

58 

56 

124 

.827 

85 

83 

82 

80 

78 

77 

75 

73 

71 

69 

67 

65 

63 

60 

58 

125 

3.933 

86 

84 

83 

81 

80 

78 

76 

74 

72 

71 

69 

66 

64 

62 

60 

126 

4.042 

87 

86 

84 

83 

81 

79 

78 

76 

74 

72 

70 

68 

66 

64 

62 

127 

.154 

88 

87 

85 

84 

82 

81 

79 

77 

75 

74 

72 

70 

68 

65 

63 

128 

.268 

90 

88 

87 

85 

84 

82 

80 

79 

77 

75 

73 

71 

69 

67 

65 

129 

.385 

91 

89 

88 

86 

85 

83 

82 

80 

78 

76 

75 

73 

71 

69 

67 

130 

4.504 

92 

91 

89 

88 

86 

85 

83 

81 

80 

78 

76 

74 

72 

70 

68 

131 

.627 

93 

92 

90 

89 

87 

86 

84 

83 

81 

79 

77 

76 

74 

72 

70 

132 

.752 

94 

93 

92 

90 

89 

87 

86 

84 

82 

81 

79 

77 

75 

73 

71 

133 

.880 

96 

94 

93 

91 

90 

88 

87 

85 

84 

82 

80 

78 

77 

75 

73 

134 

5.011 

97 

95 

94 

93 

91 

90 

88 

87 

85 

83 

82 

80 

78 

76 

74 

135 

5.145 

98 

97 

95 

94 

92 

81 

89 

88 

86 

85 

83 

81 

80 

78 

76 

136 

.282 

99 

98 

96 

95 

94 

92 

91 

89 

88 

86 

84 

83 

81 

79 

77 

137 

.422 

100 

99 

98 

96 

95 

93 

92 

90 

89 

87 

86 

84 

82 

81 

79 

138 

.565 

101 

100 

99 

97 

96 

95 

93 

92 

90 

89 

87 

85 

84 

82 

80 

139 

.712 

10:} 

101 

100 

99 

97 

96 

94 

93 

hi 

90 

88 

87 

85 

83 

82 

140 

5.862 

104 

102 

101 

100 

98 

97 

96 

94 

93 

91 

90 

88 

86 

85 

83 

TABLE  I. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  30.0  inches. 


Air 

temp. 
t 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

46 

47 

48 

49 

50 

51 

52 

53 

54 

55 

56 

57 

58 

59 

60 

106 

—56 

107 

—12 

108 

±  0 

-26 

109 

+  8 

—  6 

110 

14 

+  4 

—16 

111 

19 

11 

-  1 

-35 

112 

23 

17 

+  8 

-  8 

113 

27 

21 

14 

+  3 

—19 

114 

30 

25 

19 

11 

-  2 

-50 

115 

33 

29 

23 

16 

+  7 

-10 

116 

36 

32 

27 

21 

14 

+  2 

-22 

117 

39 

35 

30 

25 

19 

10 

-  3 

118 

42 

38 

34 

29 

23 

16 

+  7 

-11 

119 

44 

41 

37 

32 

27 

21 

14 

+  2 

—25 

120 

47 

43 

39 

35 

30 

25 

19 

10 

—  4 

121 

49 

46 

42 

38 

34 

29 

23 

16 

+  6 

-12 

122 

51 

48 

45 

41 

37 

32 

27 

21 

14 

+  1 

-27 

123 

53 

50 

47 

44 

40 

36 

31 

25 

19 

10 

-  4 

124 

55 

52 

49 

46 

43 

39 

34 

29 

24 

17 

+  7 

—  13 

125 

57 

54 

52 

49 

45 

42 

37 

33 

28 

2'2 

14 

+  2 

-29 

126 

59 

56 

54 

51 

48 

44 

40 

36 

31 

26 

19 

11 

—  4 

127 

61 

58 

56 

53 

50 

47 

43 

39 

35 

30 

24 

17 

+  7 

-13 

128 

63 

60 

58 

55 

52 

49 

46 

42 

38 

33 

28 

22 

14 

+  2 

-2T 

129 

64 

62 

60 

57 

54 

51 

48 

45 

41 

37 

32 

26 

20 

11 

-  4 

130 

66 

64 

62 

59 

56 

54 

51 

47 

44 

40 

35 

30 

25 

17 

+  7 

131 

68 

66 

•  63 

61 

58 

56 

53 

50 

46 

43 

39 

34 

29 

23 

15 

132 

69 

67 

65 

63 

60 

58 

55 

52 

49 

45 

42 

37 

32 

27 

21 

133 

71 

69 

67 

64 

62 

60 

57 

54 

51 

48 

44 

40 

36 

31 

25 

134 

73 

71 

68 

66 

64 

62 

59 

56 

53 

50 

47 

43 

39 

34 

29 

135 

74 

72 

70 

68 

66 

88 

61 

58 

56 

53 

50 

46 

42 

38 

33 

136 
137 

76 

77 

I 

72 
73 

70 
71 

67 
69 

65 

07 

63 
65 

60 
62 

58 
60 

55 
57 

52 

54 

49 
51 

45 

48 

41 

44 

37 
40 

138 

78 

77 

75 

73 

71 

<}<.) 

66 

64 

62 

59 

56 

53 

50 

47 

43 

139 

80 

78 

76 

74 

72 

70 

68 

66 

64 

61 

58 

56 

53 

60 

46 

140 

81 

80 

78 

76 

74 

72 

70 

68 

65 

63 

GO 

58 

55 

52 

4& 

DEW-POINT 

24 

TABLE  II. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure=»=29.0  inches. 


Air 

Vapor 

Depression  of  wet-bulb  thermometer  (t  —  </). 

t 

e 

.2 

.4 

.6 

.8 

1.0   1.2 

1.4 

1.6 

l.fi 

2.0   2.2 

2.4 

2.6 

2.8 

3.0 

—40 
-39 

.g{ 

.0039 
41 
44 

—61 
-50 
49 

r 

1 

tM 

-37 

46 

-47 

€ 

' 

€ 

.1 

.2 

.3 

.4 

.5 

—36 

48 

—46 

—36 

.0051 

—44 

—60 

.0010 

-50 

.0021 

—60 

-34 

54 

-43 

—58 

-59 

11 

-49 

22 

-58 

—33 

57 

—41 

—55 

—58 

12 

-48 

24 

-56 

—32 

61 

-40 

-52 

-57 

13 

-47 

26 

-55 

-31 

65 

-38 

-49 

-56 

13 

—46 

27 

-53 

-30 

.0069 

—36 

—47 

-55 

.0015 

—45 

.  0029 

-51 

-29 

74 

-34 

-44 

—54 

16 

-44 

31 

-50 

-59 

-28 

78 

—33 

-42 

-56 

-53 

17 

-43 

33 

—49 

-57 

-27 

83 

-32 

-40 

-52 

-52 

18 

-42 

35 

-48 

-55 

-26 

89 

-30 

-37 

-49 

-51 

19 

-41 

37 

-46 

—53 

-25 
—24 

.0094 
.0100 

-29 

-28 

-35 
—34 

-45 
-42 

-57 

-39 

.0039 
41 

—45 
-44 

-50 

-60 

-23 

106 

-27 

-32 

-40 

-51 

-38 

44 

-43 

-49 

-58 

-22 

112 

-26 

-30 

-37 

-47 

-37 

46 

-42 

-47 

-55 

-21 

119 

-24 

-29 

-34 

-44 

-60 

-36 

48 

-41 

-46 

-53 

—20 

.0126 

-23 

—28 

-33 

—40 

—53 

-35 

.0051 

-40 

-44 

-51 

-  19 

133 

-22 

-26 

-31 

-37 

-48 

-34 

54 

-38 

-43 

-49 

-58 

-18 

141 

-  21 

—25 

-29 

—34 

—44 

—33 

57 

-37 

-41 

-47 

-55 

-17 

150 

--20 

--23 

-27 

-32 

-40 

-55 

-32 

61 

-35 

-40 

-45 

-52 

—16 

159 

-18 

-22 

-26 

-30 

-37 

--48 

—31 

65 

-34 

-38 

-43 

-49 

-58 

-15 

.0168 

-17 

-20 

-24 

28 

-34 

-43 

-59 

-30 

.0069 

-33 

-36 

-41 

-47 

-54 

-14 

178 

-16 

-19 

-22 

-26 

-31 

-39 

-51 

-13 
—12 

188 
199 

-15 
-14 

-18 
-17 

-21 

-19 

-24 
-23 

-29 

-27 

-35 
-32 

-45 
-40 

-63 

—11 

210 

-13 

-15 

-18 

-21 

-25 

-29 

-36 

-46 

-10 

.0222 

-12 

-14 

-17 

-19 

-23 

-27 

-32 

-40 

-56 

-  9 

234 

-11 

—13 

-15 

-18 

-21 

-25 

-29 

-36 

-47 

~  8 

247 

-10 

-12 

-14 

-16 

-19 

-23 

-27 

-32 

-41 

-55 

-  7 

260 

-  9 

-11 

-13 

-15 

-18 

-21 

-24 

-29 

-35 

-46 

-  6 

275 

-  8 

-10 

-12 

-14 

-16 

-19 

-22 

-20 

-32 

-40 

-54 

—  5 

.0291 

-  7 

-  8 

-10 

-12 

-15 

-17 

-20 

-24 

-29 

-35 

-45 

—  4 

307 

-  5 

-  7 

-  9 

-11 

—13 

-16 

-18 

-22 

-26 

-30 

-38 

—50 

-  3 

325 

-  4 

-  6 

-  8 

^-10 

-12 

-14 

-16 

-19 

-23 

-27 

-32 

-42 

-59 

-  2 

344 

-  3 

-  5 

-  6 

-  8 

--10 

-12 

—15 

-17 

-20 

-24 

-29 

-35 

-47 

-  1 

363 

2 

-  4 

-  5 

t  fj 

-  9 

-11 

-13 

-15 

-18 

-  21 

-25 

-30 

-38 

-51 

0 

.0383 

-  1 

-  3 

-  4 

-  5 

-  7 

—  9 

-11 

-13 

-16 

-19 

-22 

-26 

-32 

-40 

-57 

"HI 

403 

±  0 

-  2 

-  3 

—  4 

—  6 

-  7 

—  9 

-12 

-14 

-16 

-19 

-23 

-28 

-34  -44 

2 

423 

+  1 

±  0 

-  2 

-  3 

-  5 

—  6 

-  8 

-10 

-12 

-14 

-  17 

-20 

-24 

-29   -35 

3 

444 

2 

+  1 

-  1 

-  2 

-  3 

-  5 

-  6 

-  8 

—10 

-12 

-15 

-18 

21 

—25 

-30 

4 

467 

3 

2 

±  0 

1 

-  2 

-  4 

—  5 

-  7 

-  9 

-11 

—13 

-15 

-18 

-22 

-26 

5 

.0491 

4 

3 

+  2 

±  0 

-  1 

—  2 

-  4 

-  5 

-  7 

-  9 

-11 

13 

16 

-19 

-22 

6 

515 

5 

4 

3 

+  1 

db  0 

-  1 

-  2 

-  4 

-  5 

-  7 

-  9 

-11 

-14 

—16  -19 

7 

542 

6 

5 

4 

3 

+  1 

±  0 

-  1 

—  3 

-  4 

5 

-  7 

-  9 

-12 

-14   -16 

8 

570 

7 

6 

5 

4 

3 

+  1 

±  0 

-  1 

-  3 

—  4 

—  5 

-  7 

-10 

-12   -14 

9 

600 

8 

7 

6 

5 

4 

3 

+  1 

i  0 

1 

3  1 

—  4 

g 

g 

10 

.0631 

9 

8 

7 

6 

5 

4 

3 

4-  1 

±  0 

11 

665 

10 

9 

8 

7 

6 

5 

4 

1"  A 

3 

+  2 

±  0 

-  1 

-  2 

—  4 

—  6   —  7 

12 

699 

11 

10 

9 

9 

8 

7 

6 

4 

3 

+  2 

-4-  1 

—  1 

—  2 

—  4   —  5 

13 

735 

12 

11 

11 

10 

9 

8 

7 

6 

5 

3 

2 

+  1 

—  l 

—  2   —  4 

14 

772 

13 

12 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

+  1 

±  0   -  2 

15 

.0810 

14 

13 

13 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

+  1  I  -*-  0 

16 

850 

15 

15 

14 

13 

12 

11 

10 

9 

9 

8 

7 

6 

4 

31-4-2 

17 

891 

16 

16 

15 

14 

13 

12 

12 

11 

10 

9 

8 

7 

6 

5 

4 

18 

933 

17 

17 

16 

15 

14 

14 

13 

12 

11 

10 

9 

8 

7 

0 

5 

19 

.0979 

18 

18 

17 

16 

15 

15 

14 

13 

12 

11 

11 

10 

9 

8 

7 

20 

.1026 

19 

19 

18 

17 

17 

16 

15 

14 

13 

13 

12 

11 

10 

9 

8 

TABLE  II. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  29.0  inches. 


Air 
temp. 
t 

Depression  of  wet-bulb  thermometer  (t—f). 

3.2 

3  4 

3.6 

3.8 

4.0 

4.2 

4.4 

4.6 

4.8 

5.0 

5.2 

5.4 

5.6 

f>  8 

6.0 

2 

-47 

3 

-37 

—50 

4 

-31 

-40 

-55 

5 

-27 

-32 

-42 

-59 

6 

-23 

-28 

-34 

-44 

7 

-20 

-24 

-28 

-35 

-47 

8 

-17 

-20 

-24 

-'29 

-36 

-49 

9 

-14 

-17 

-20 

-24 

-29 

-37 

-50 

10 

-12 

-14 

-17 

-20 

-25 

-30 

-37 

-52 

11 

y 

-12 

-14 

—17 

-20 

-25 

—  3'» 

—38 

—53 

12 

-  7 

Q 

-11 

-14 

-17 

-20 

-24 

-30 

-38 

-52 

13 

-  5 

7 

-    9 

—  11 

-14 

-17 

-20 

24 

—29 

-37 

51 

14 

-  3 

-  5 

-  7 

-  9 

-11 

-13 

--16 

-19 

-24 

-29 

-36 

-49 

15 

-1 

—  3 

-  4 

—  6 

-  8 

-10 

-13 

-16 

—  19 

-23 

-28 

-35 

-48 

16 

4-    0 

-  1 

0 

—  4 

—  6 

-  8 

-10 

-12 

-15 

-18 

-22 

-27 

-33 

-45 

17 

+  2 

+  1 

±  0 

-  2 

A 

-  5 

—  7 

-  9 

—12 

-14 

-17 

-21 

—26 

-32 

-42 

18 

4 

8 

+  l 

4-   0 

-  2 

3 

-  5 

-  7 

—  <» 

-11 

-14 

-17 

-20 

-24 

-30 

19 

6 

4 

3 

+  2 

±  0 

-  i 

—  3 

-  4 

—  6 

—  8 

-10 

-13 

-16 

-19 

—23 

20 

7 

6 

5 

4 

+  2 

+  i 

r      1 

—  2 

—  4 

-  5 

-  7 

-10 

-12 

-15 

-18 

DEW-POINT 

26 

TABLE  II. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  29.0  inches. 


Air 
temp 

Vapor 
press. 

Depression  of  wet-bulb  thermometer  (t—f). 

t 

e 

0.5 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

20 

0.103 

18 

17 

15 

13 

11 

8 

5 

2 

-1 

-5 

-11 

-18 

-30 

21 

.108 

19 

18 

16 

14 

12 

10 

7 

4 

+1 

—3 

-  8 

-14 

-23 

-42 

22 

.113 

20 

19 

17 

15 

13 

11 

9 

6 

3 

-1 

-  5 

-10 

-17 

-29 

23 

.118 

22 

20 

18 

16 

14 

12 

10 

8 

5 

+1 

-  3 

-  7 

-13 

-22 

-40 

24 

.124 

23 

21 

19 

18 

16 

14 

11 

9 

6 

3 

±  0 

-  4 

-10 

-17 

-28 

25 

0.130 

24 

22 

21 

19 

17 

15 

13 

11 

8 

5 

+  2 

-  2 

-  6 

-12 

-21 

•  36 

26 

.136 

25 

23 

22 

20 

18 

16 

14 

12 

10 

7 

4 

±  0 

-  4 

-  9 

-15 

-26 

27 

.143 

26 

24 

23 

21 

20 

18 

16 

14 

12 

9 

6 

+  3 

-  1 

-  5 

-11 

-19 

28 

.150 

27 

25 

24 

22 

21 

19 

17 

15 

13 

11 

8 

5 

+  2 

-  2 

—  7 

-14 

29 

.157 

28 

26 

25 

24 

22 

20 

19 

17 

15 

12 

10 

7 

4 

±  0 

-  4 

g 

30 

0.164 

29 

27 

26 

25 

23 

22 

20 

18 

16 

14 

12 

9 

6 

+  3 

-  1 

-  5 

31 

.172 

30 

29 

27 

26 

24 

23 

21 

20 

18 

16 

13 

11 

8 

5 

+  2 

-  2 

32 

.180 

31 

30 

28 

27 

26 

24 

23 

21 

19 

17 

15 

13 

10 

8 

4 

+  1 

33 

.187 

32 

31 

29 

28 

27 

25 

24 

22 

21 

19 

17 

15 

12 

10 

7 

3 

34 

.195 

33 

32 

30 

29 

28 

27 

25 

24 

22 

20 

18 

16 

14 

12 

9 

6 

35 

0.203 

34 

33 

31 

30 

29 

28 

26 

25 

23 

22 

20 

18 

16 

14 

11 

8 

36 

.211 

35 

34 

32 

31 

30 

29 

27 

26 

25 

23 

21 

20 

18 

15 

13 

11 

37 

.219 

36 

35 

33 

32 

31 

30 

28 

27 

26 

24 

23 

21 

19 

17 

15 

13 

38 

.228 

37 

36 

34 

33 

32 

31 

30 

28 

27 

26 

24 

23 

21 

19 

17 

14 

39 

.237 

38 

37 

36 

34 

33 

32 

31 

29 

28 

27 

25 

24 

22 

21 

19 

16 

40 

0.247 

39 

38 

37 

35 

34 

33 

32 

31 

29 

28 

27 

25 

23 

22 

20 

18 

41 

.256 

40 

39 

38 

37 

35 

34 

33 

32 

30 

29 

28 

26 

25 

23 

20 

42 

.266 

41 

40 

39 

38 

36 

35 

34 

33 

32 

30 

29 

28 

26 

25 

23 

21 

43 

.277 

42 

41 

40 

39 

38 

36 

35 

34 

33 

31 

30 

29 

27 

26 

24 

23 

44 

.287 

43 

42 

41 

40 

39 

38 

36 

35 

34 

32 

31 

30 

29 

27 

26 

24 

45 

0.298 

44 

43 

42 

41 

40 

39 

37 

36 

35 

•34 

32 

31 

30 

29 

27 

26 

46 

.310 

45 

44 

43 

42 

41 

40 

39 

37 

36 

35 

34 

32 

31 

30 

28 

27 

47 

..322 

46 

45 

44 

43 

42 

41 

40 

39 

37 

36 

35 

34 

32 

31 

30 

28 

48 

.334 

47 

46 

45 

44 

43 

42 

41 

40 

39 

37 

36 

35 

34 

32 

31 

30 

49 

.347 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

37 

36 

35 

34 

32 

31 

50 

0.360 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

37 

36 

35 

34 

32 

51 

.373 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

37 

36 

35 

34 

52 

.387 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

37 

36 

35 

53 

.402 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

36 

54 

.417 

63 

52 

51 

50 

49 

49 

48 

47 

46 

44 

43 

42 

41 

40 

39 

38 

65 

0.432 

54 

53 

52 

52 

51 

50 

49 

48 

47 

46 

45 

4:5 

42 

41 

40 

39 

66 

.448 

55 

54 

53 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

41 

40 

67 

.465 

56 

55 

54 

54 

53 

52 

51 

50 

49 

48 

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46 

45 

44 

43 

42 

58 

.482 

57 

56 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

59 

.499 

68 

57 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

60 

0.517 

59 

58 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

61 

.536 

60 

59 

59 

58 

57 

56 

55 

54 

53 

52 

52 

51 

50 

49 

48 

46 

62 

.555 

61 

60 

60 

59 

58 

57 

56 

55 

55 

54 

53 

52 

51 

50 

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63 

.575 

62 

61 

61 

60 

59 

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57 

56 

56 

55 

54 

53 

52 

51 

50 

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64 

.595 

63 

62 

62 

61 

60 

59 

58 

58 

57 

56 

55 

54 

53 

52 

61 

50 

65 

0.616 

64 

63 

63 

62 

61 

60 

59 

59 

58 

57 

56 

55 

54 

53 

52 

51 

66 

.638 

65 

64 

64 

63 

62 

61 

61 

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67 

.661 

66 

65 

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63 

62 

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60 

59 

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68 

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67 

67 

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65 

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63 

63 

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60 

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68 

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67 

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65 

64 

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60 

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69 

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70 
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0.732 

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69 
70 

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70 

68 
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63 
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72 

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71 

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60 

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72 

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74 

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73 

73 

72 

71 

70 

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67 

67 

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75 
76 
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0.866 
.896 
.926 
.957 
0.989 

74 

75 
76 

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76 
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73 

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72 
73 
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76 

71 

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71 
72 
73 
74 
75 

70 
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74 

69 
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72 
73 

68 
70 
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72 
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68 
69 
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67 
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69 
70 
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66 
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69 
70 

65 
66 
68 
69 
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65 
66 
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69 

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65 
66 
67 
68 

63 

64 
65 
66 
67 

80 

1.022 

79 

79 

78 

77 

77 

76 

75 

75 

74 

73 

72 

72 

71 

70 

69 

69 

DEW-POINT 

27 

TABLE  II. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  29.0  inches. 


Air 

temp. 
t 

Vapor 
press. 

• 

Depression  of  wet-bulb  thermometer  (<—<'). 

8.5 

9.0 

9.5 

10.0 

10.5 

11.0 

11.5 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

15.0 

15.5  16.0 

26 

0.136 

-53 

1 

27 

.143 

-32 

28 

.150 

-23 

-45 

29 

.157 

-17 

-29 

30 

0.164 

-11 

-20 

-36 

31 

.172 

-  7 

-14 

-24 

-50 

32 

.180 

-  4 

-  9 

-16 

-29 

33 

.187 

-  1 

-  5 

-11 

-20 

—36 

34 

.195 

+  2 

-  2 

-  7 

—  14 

-24 

-50 

35 

0.203 

5 

+  1 

-  3 

-  8 

-16 

-28 

36 

.211 

8 

4 

±  0 

-  4 

-10 

-19 

-34 

37 

.219 

10 

7 

+  * 

-  1 

-  6 

-12 

-22 

-44 

38 

.228 

12 

9 

6 

+  3 

2 

Y 

-14 

-25 

39 

.237 

14 

12 

9 

6 

+  2 

-  3 

-  8 

-16 

-30 

40 

0.247 

16 

14 

11 

8 

5 

+  1 

-  4 

-10 

-18 

-35 

41 

.256 

18 

16 

13 

11 

8 

4 

±  0 

-  5 

-11 

-21 

-45 

42 

.266 

19 

17 

15 

13 

10 

7 

+  4 

^  -I 

-  6 

-13 

-24 

-59 

43 

.277 

21 

19 

17 

15 

13 

10 

7 

+  3 

-  2 

-  7 

-15 

-28 

44 

.287 

23 

21 

19 

17 

15 

12 

9 

6 

+  2 

-  2 

-  8 

-17 

-32 

45 

0.298 

24 

22 

20 

19 

17 

14 

11 

8 

6 

+  2 

-  3 

-  9 

-18 

-37 

46 

.310 

25 

24 

22 

20 

18 

16 

14 

11 

8 

5 

+  1 

-  4 

-11 

-20 

-44 

47 

.322 

27 

25 

24 

22 

20 

18 

16 

13 

11 

8 

4 

±  0 

—  5 

-12 

-23 

-53 

48 

.334 

28 

27 

25 

23 

22 

20 

18 

15 

13 

1C 

7 

+  * 

-  1 

-  6 

—13 

-25 

49 

.347 

29 

28 

27 

25 

23 

21 

20 

17 

15 

13 

10 

7 

+  3 

-  2 

-  7 

-15 

50 

0.360 

31 

29 

28 

27 

25 

23 

21 

19 

17 

15 

12 

9 

6 

+  2 

-  2 

-  8 

51 

.373 

32 

31 

29 

28 

26 

25 

23 

21 

19 

17 

15 

12 

9 

6 

+  2 

-  3 

52 

.387 

34 

32 

31 

29 

28 

26 

25 

23 

21 

19 

17 

14 

12 

9 

5 

+  1 

53 

.402 

35 

34 

32 

31 

29 

28 

26 

24 

23 

21 

19 

16 

14 

11 

9 

5 

54 

.417 

36 

35 

34 

32 

31 

29 

28 

26 

24 

S3 

21 

19 

16 

14 

11 

8 

55 

0.432 

38 

36 

35 

34 

32 

31 

29 

28 

26 

24 

23 

21 

19 

16 

14 

11 

56 

.448 

39 

38 

36 

35 

34 

32 

31 

29 

28 

26 

24 

23 

21 

19 

16 

14 

57 

.465 

40 

39 

38 

36 

35 

34 

32 

31 

29 

28 

26 

24 

22 

21 

18 

16 

58 

.482 

42 

40 

39 

38 

36 

35 

34 

32 

31 

29 

28 

26 

24 

22 

20 

18 

59 

.499 

43 

42 

40 

39 

38 

37 

35 

34 

32 

31 

29 

28 

26 

24 

22 

20 

60 

0.517 

44 

43 

42 

41 

39 

38 

37 

35 

34 

32 

31 

29 

28 

26 

24 

22 

61 

.536 

45 

44 

43 

42 

41 

39 

38 

37 

35 

34 

32 

31 

29 

28 

26 

24 

62 

.555 

47 

46 

44 

43 

42 

41 

40 

38 

37 

35 

34 

32 

31 

30 

28 

26 

63 

.575 

48 

47 

46 

45 

43 

42 

41 

40 

38 

37 

36 

34 

33 

31 

30 

28 

64 

.595 

49 

48 

47 

46 

45 

44 

42 

41 

40 

38 

37 

36 

34 

33 

31 

30 

65 

0.  616 

50 

49 

48 

47 

46 

45 

44 

43 

41 

40 

39 

37 

36 

34 

33 

31 

66 

.638 

52 

51 

50 

48 

47 

46 

45 

44 

43 

42 

40 

39 

37 

36 

35 

33 

67 

.601 

53 

52 

51 

50 

49 

48 

46 

45 

44 

43 

42 

40 

39 

38 

36 

35 

68 

.684 

54 

53 

52 

51 

50 

49 

48 

47 

46 

44 

43 

42 

41 

39 

38 

36 

69 

.707 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

43 

42 

41 

40 

38 

70 

0.732 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

42 

41 

40 

71 

.757 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

47 

46 

45 

44 

43 

41 

72 

.783 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

46 

45 

44 

43 

73 

.810 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

44 

74 

.838 

61 

60 

59 

58 

57 

56 

55 

54 

54 

53 

52 

50 

49 

48 

47 

46 

75 

0.866 

62 

61 

60 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

48 

47 

76 

.896 

63 

62 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

77 

.926 

64 

64 

63 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

78 

.957 

66 

65 

64 

63 

62 

61 

60 

59 

59 

58 

57 

56 

55 

54 

53 

52 

79 

0.989 

67 

66 

65 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

80 

1.022 

68 

67 

66 

65 

64 

64 

63 

62 

61 

60 

59 

58 

57 

56 

55 

54 

DEW-POINT 

28 

TABLE  II.— Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  29.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t—f). 

tCIHJ). 

t 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

20.0 

20.5 

21.0 

21.5 

22.0 

22.5 

23.0 

23.5 

24.0 

49 

-28 

50 

-17 

-32 

61 

—10 

-18 

-37 

52 

-  4 

-11 

-20 

-45 

53 

±  0 

-  5 

-12 

—23 

-55 

54 

+  6 

±  0 

—  6 

-13 

-25 

55 

8 

+  * 

-\ 

-  6 

-14 

-27 

66 

11 

7 

+  4 

-  1 

-  7 

-16 

-30 

57 

13 

10 

7 

+  3 

-  2 

-  8 

-17 

-33 

58 

16 

13 

10 

7 

+  3 

-  2 

—  9 

-18 

-37 

59 

18 

16 

13 

10 

7 

+  2 

-  3 

-  9 

-19 

-41 

60 

20 

18 

16 

13 

10 

6 

+  2 

-  3 

-10 

-20 

-46 

61 

22 

20 

18 

16 

13 

10 

6 

+  2 

-  3 

-10 

-21, 

-51 

62 

24 

22 

20 

18 

16 

13 

10 

6 

+  2 

-  4 

-11 

-22 

—59 

63 

26 

24 

22 

20 

18 

16 

13 

10 

6 

+  2 

—  4 

-11 

-23 

64 

28 

26 

25 

23 

21 

18 

16 

13 

10 

6 

+  1 

-  4 

-12 

-24 

65 

30 

28 

26 

25 

23 

21 

18 

16 

13 

10 

6 

+  1 

—  4 

-12 

—25 

66 

31 

30 

28 

27 

25 

23 

21 

18 

16 

13 

10 

6 

+  1 

-  4 

-12 

-26 

67 

33 

32 

30 

29 

27 

25 

23 

21 

19 

16 

13 

10 

6 

+  1 

—  4 

-12 

68 

35 

33 

32 

30 

29 

27 

25 

23 

21 

19 

16 

13 

10 

6 

+  1 

-  4 

69 

37 

35 

34 

32 

31 

29 

27 

25 

23 

21 

19 

16 

13 

10 

6 

+  1 

70 

38 

37 

35 

34 

32 

31 

29 

27 

25 

23 

21 

19 

16 

13 

10 

6 

71 

40 

38 

37 

36 

34 

32 

31 

29 

27 

26 

24 

21 

19 

17 

14 

10 

72 

42 

40 

39 

37 

36 

34 

32 

31 

29 

28 

26 

24 

21 

19 

17 

14 

73 

43 

42 

40 

39 

38 

36 

34 

33 

31 

30 

28 

'26 

24 

22 

19 

17 

74 

45 

43 

42 

41 

39 

38 

36 

35 

33 

32 

30 

28 

26 

24 

22 

20 

75 

46 

45 

44 

42 

41 

40 

38 

37 

35 

33 

32 

30 

28 

26 

24 

22 

76 

48 

46 

45 

44 

43 

41 

40 

38 

37 

35 

34 

32 

30 

29 

27 

25 

77 

49 

48 

47 

46 

44 

43 

42 

40 

39 

37 

36 

34 

32 

31 

29 

27 

78 

50 

49 

48 

47 

46 

44 

43 

42 

41 

39 

38 

36 

34 

33 

31 

29 

79 

52 

51 

50 

49 

47 

46 

45 

44 

42 

41 

39 

38 

36 

35 

33 

31 

80 

53 

52 

51 

50 

49 

48 

46 

45 

44 

43 

41 

40 

38 

37 

35 

33 

| 

Depression  of  wet-bulb  thermometer  (<—<')• 

24.5 

25.0 

25.5 

26.0 

26.5 

27.0 

27.6 

28.0 

28.5 

29.0 

29.  5  30.  0 

30.5 

31.0 

31.6 

67 

-26 

68 

-12 

-26 

69 

-  4 

-13 

-27 

70 

+  1 

-  4 

-12 

-27 

71 

6 

+  2 

-  4 

-12 

-26 

72 

10 

7 

+  2 

-  4 

-12 

-26 

73 

14 

11 

7 

+  2 

—  4 

-12 

-26 

74 

17 

14 

11 

7 

+  2 

-  3 

-12 

-25 

75 

20 

17 

14 

11 

7 

+  3 

-  3 

-11 

-25 

76 

23 

20 

18 

15 

11 

8 

-  3 

-10 

-24 

77 

25 

23 

20 

18 

15 

12 

8 

+  3 

-  2 

-10 

-22 

78 

27 

25 

23 

21 

18 

15 

12 

8 

+  4 

-  2 

-  9  -21 

79 

29 

28 

26 

24 

21 

19 

16 

13 

9 

+  4 

-  1   -  9 

-ao 

80 

31 

30 

28 

26 

24 

22 

19 

16 

13 

9 

+  5   -  1 

-  8 

-19 

-64 

DEW-POINT 

29 

TABLE  II.  ~ Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  29.0  inches. 


Air 
;emp. 
t 

Vapor 
press. 

e 

Depression  of  wet-bulb  thermometer  (I  —  tT). 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

80 

1.022 

79 

77 

76 

75 

73 

72 

70 

69 

67 

65 

64 

62 

60 

58 

56 

81 

.056 

80 

78 

77 

76 

74 

73 

71 

70 

68 

6« 

65 

63 

61 

60 

58 

.091 

81 

79 

78 

77 

75 

74 

72 

71 

69 

68 

66 

64 

63 

61 

59 

83 

.127 

82 

80 

79 

78 

76 

75 

73 

72 

70 

69 

67 

65 

64 

62 

60 

84 

.163 

83 

81 

80 

79 

77 

76 

74 

73 

71 

70 

68 

67 

65 

63 

61 

85 

1.201 

84 

82 

81 

80 

78 

77 

75 

74 

72 

71 

69 

68 

66 

64 

63' 

86 

.241 

85 

83 

82 

81 

79 

78 

77 

75 

74 

72 

71 

69 

67 

66 

64 

87 

.281 

86 

84 

83 

82 

80 

79 

78 

76 

75 

73 

72 

70 

69 

67 

65 

88 

.322 

87 

85 

84 

83 

81 

80 

79 

77 

76 

74 

73 

71 

70 

68 

66 

89 

.364 

88 

86 

85 

84 

82 

81 

80 

78 

77 

75 

74 

72 

71 

69 

68 

90 

1.408 

89 

87 

86 

85 

84 

82 

81 

79 

78 

77 

75 

74 

72 

70 

69 

91 

.453 

90 

88 

87 

86 

85 

83 

82 

80 

79 

78 

76 

75 

73 

72 

70 

92 

.499 

91 

90 

88 

87. 

86 

84 

83 

82 

80 

79 

77 

76 

74 

73 

71 

93 

.546 

92 

91 

89 

88 

87 

85 

84 

83 

81 

80 

78 

77 

75 

74 

72 

94 

.595 

93 

92 

90 

89 

88 

86 

85 

84 

82 

81 

80 

78 

77 

75 

74 

95 

1.645 

94 

93 

91 

90 

89 

87 

86 

85 

83 

82 

81 

79 

78 

76 

75 

96 

.696 

95 

94 

92 

91 

90 

88 

87 

86 

84 

83 

82 

80 

79 

77 

76 

97 

.749 

96 

95 

93 

92 

91 

90 

88 

87 

86 

84 

83 

81 

80 

78 

77 

98 

.8(»3 

97 

96 

94 

93 

92 

91 

89 

88 

87 

85 

84 

82 

81 

80 

78 

99 

.859 

98 

97 

95 

94 

93 

92 

90 

89 

88 

86 

85 

84 

82 

81 

79 

100 

1.916 

99 

98 

96 

95 

94 

93 

91 

90 

89 

87 

86 

85 

83 

82 

80 

101 

1.975 

100 

99 

97 

96 

95 

94 

92 

91 

90 

88 

87 

86 

84 

83 

82 

102 

2.035 

101 

100 

98 

97 

96 

95 

93 

92 

91 

90 

88 

87 

86 

84 

83 

103 

.097 

102 

101 

99 

98 

97 

96 

94 

93 

92 

91 

89 

88 

87 

85 

84 

104 

.160 

103 

102 

100 

99 

98 

97 

96 

94 

93 

92 

90 

.89 

88 

86 

85 

105 

2.  225 

104 

103 

101 

100 

99 

98 

97 

95 

94 

93 

91 

90 

89 

87 

86 

106 

.292 

105 

104 

102 

101 

100 

99 

98 

96 

95 

94 

92 

91 

90 

89 

87 

107 

.360 

106 

105 

103 

102 

101 

100 

99 

97 

96 

95 

94 

92 

91 

90 

88 

108 

.431 

107 

106 

104 

103 

102 

101 

100 

98 

97 

96 

95 

93 

92 

91 

89 

109 

.503 

108 

107 

105 

104 

103 

102 

101 

99 

98 

97 

96 

94 

93 

92 

90 

110 

2.  576 

109 

108 

107 

105 

104 

103 

102 

101 

99 

98 

97 

95 

94 

93 

92 

111 

.li52 

no 

109 

108 

106 

105 

104 

103 

102 

100 

99 

98 

97 

95 

!)4 

93 

112 

.730 

in 

110 

109 

107 

106 

105 

104 

103 

101 

100 

99 

98 

96 

95 

94 

113 

.810 

112 

111 

110 

108 

107 

106 

105 

104 

102 

101 

100 

99 

97 

96 

95 

114 

.891 

113 

112 

111 

109 

108 

107 

106 

105 

103 

102 

101 

100 

98 

97 

96 

I 

115 

2.975 

114 

113 

112 

110 

109 

108 

107 

106 

104 

103 

102 

101 

100 

98 

97 

116 

3.061 

115 

114 

113 

111 

110 

109 

108 

107 

106 

104 

103 

102 

101 

99 

98 

117 

.148 

116 

115 

114 

112 

111 

110 

109 

108 

107 

105 

104 

103 

102 

100 

99 

118 

.239 

117 

116 

115   113 

112 

111 

110 

109 

108 

106 

105 

104 

103 

101 

100 

119 

.331 

118 

117 

116 

114 

113 

112 

111 

110 

109 

107 

106 

105 

104 

103 

101 

120 

3.  425 

119 

118 

117 

115 

114 

113 

112 

111 

110 

108 

107 

106 

105 

104 

102 

121 

.522 

120 

119 

118 

117 

115 

114 

113 

112 

111 

110 

108 

107 

TJ6 

105 

103 

12fi 

.621 

121 

120 

119 

118 

116 

115 

114 

113 

112 

111 

109 

108 

107 

106 

105 

123 

.723 

122 

121 

120 

119 

117 

116 

115 

114 

113 

112 

110 

109 

1<>8 

107 

106 

124 

.827 

123 

122 

121 

120 

118 

117 

116 

115 

114 

113 

111 

110 

109 

108 

107 

125 

3.  933 

124 

123 

122 

121 

119 

118 

117 

116 

115 

114 

112 

111 

110 

109 

108 

126 

4.042 

125 

124 

123 

122 

120 

119 

118 

117 

116 

115 

114 

112 

111 

110 

109 

127 

.154 

126 

125 

124 

123 

121 

120 

119 

118 

117 

116 

115 

113 

112 

111 

110 

128 

.268 

127 

126 

125 

124 

122 

121 

120 

119 

118 

117 

116 

114 

113 

112 

111 

129 

.385 

128 

127 

126 

125 

123 

122 

121 

120 

119 

118 

117 

115 

114 

113 

112 

130 

4.904 

129 

128 

127 

126 

124 

123 

122 

121 

120 

119 

118 

117 

115 

114 

113 

131 

,627 

130 

129 

128 

127 

125 

124 

123 

122 

121 

120 

119 

118 

116 

115 

114 

132 

.752 

131 

130 

129 

128 

127 

125 

124 

123 

122 

121 

120 

119 

117 

116 

115 

133 

4.  880 

132 

131 

130 

129 

128 

126 

125 

124 

123 

122 

121 

120 

118 

117 

116 

134 

5.011 

133 

132 

131 

130 

129 

127 

126 

125 

124 

123 

122 

121 

119 

118 

117 

135 

5.145 

134 

133 

132 

131 

130 

128 

127 

126 

125 

124 

123 

122 

121 

119 

118 

136 

.282 

135 

134 

133 

132 

131 

129 

128 

1-27 

126 

125 

124 

123 

122 

120 

119 

137 

.422 

136 

135 

134 

133 

132 

130 

129 

128 

127 

126 

125 

124 

123 

121 

120 

138 

.565 

137 

136 

135 

134 

133 

131 

130 

129 

128 

127 

126 

125 

124 

122 

121 

139 

.712 

138 

137 

136 

135 

134 

132 

131 

130 

129 

128 

127 

126 

125 

123 

122 

140 

5.862 

139   138 

137 

136 

135 

133 

132 

131 

130 

129 

128 

127 

126 

124 

128 

DEW-POINT 
30 

TABLE  II— Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  29.0  inches. 


Air 

temp. 
t 

Vapor 
press. 
e 

Depression  of  wet-bulb  thermometer  (t  —  f). 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

80 

1.022 

54 

52 

50 

48 

45 

43 

40 

37 

33 

30 

26 

22 

16 

9 

-  1 

81 

.056 

56 

54 

52 

49 

47 

44 

42 

39 

35 

32 

28 

24 

19 

13 

+  5 

82 

.091 

57 

55 

53 

51 

48 

46 

43 

40 

37 

34 

30 

27 

22 

17 

10 

83 

.127 

68 

56 

54 

52 

50 

47 

45 

42 

39 

36 

32 

29 

25 

20 

14 

84 

.163 

60 

58 

56 

53 

51 

49 

46 

44 

41 

38 

35 

31 

27 

23 

18 

85 

1.201 

61 

59 

57 

55 

53 

50 

48 

46 

43 

40 

37 

33 

30 

26 

21 

86 

.241 

62 

60 

58 

56 

54 

52 

50 

47 

45 

42 

39 

36 

32 

28 

24 

87 

.281 

63 

62 

CO 

58 

56 

54 

51 

49 

46 

44 

41 

38 

34 

31 

27 

88 

.322 

65 

63 

61 

59 

57 

55 

53 

50 

48 

45 

43 

40 

36 

33 

29 

89 

.364 

66 

64 

62 

60 

58 

56 

54 

52 

50 

47 

44 

42 

38 

35 

31 

90 

1.408 

67 

65 

64 

09 

60 

58 

56 

54 

51 

49 

46 

43 

40 

37 

34 

91 

.453 

68 

67 

65 

63 

61 

59 

57 

65 

53 

50 

48 

45 

42 

39 

36 

92 

.499 

70 

68 

66 

64 

62 

61 

59 

57 

54 

52 

50 

47 

44 

41 

38 

93 

.546 

71 

69 

67 

66 

64 

62 

60 

58 

56 

54 

51 

49 

46 

43 

40 

94 

.595 

72 

70 

69 

67 

65 

63 

61 

59 

57 

55 

53 

50 

48 

45 

42 

95 

1.645 

73 

72 

70 

68 

66 

65 

63 

61 

59 

57 

54 

52 

60 

47 

44 

96 

.696 

74 

73 

71 

69 

68 

66 

64 

62 

60 

58 

56 

54 

52 

49 

97 

.749 

75 

74 

72 

71 

69 

67 

65 

64 

62 

60 

58 

55 

53 

51 

48 

98 

.803 

77 

75 

74 

72 

70 

69 

67 

65 

63 

61 

59 

57 

55 

52 

60 

99 

.859 

78 

76 

75 

73 

72 

70 

68 

66 

64 

62 

60 

58 

56 

54 

52 

100 

1.916 

79 

77 

76 

74 

73 

71 

69 

68 

66 

64 

62 

60 

58 

56 

53 

101 

1.975 

80 

79 

77 

76 

74 

72 

71 

69 

67 

65 

63 

61 

59 

57 

55 

102 

2.035 

81 

80 

78 

77 

75 

74 

72 

70 

68 

67 

65 

63 

61 

59 

56 

103 

.097 

82 

81 

79 

78 

76 

75 

73 

72 

70 

68 

66 

64 

62 

60 

58 

104 

.160 

84 

82 

81 

79 

78 

76 

74 

73 

71 

69 

68 

66 

64 

62 

60 

105 

2.  225 

85 

83 

82 

80 

79 

77 

76 

74 

72 

71 

69 

67 

65 

68 

61 

106 

.292 

86 

84 

83 

81 

80 

78 

77 

75 

74 

72 

70 

68 

67 

65 

63 

107 

.360 

87 

85 

84 

83 

81 

80 

78 

76 

75 

73 

72 

70 

68 

66 

64 

108 

.431 

88 

87 

85 

84 

82 

81 

79 

78 

76 

74 

73 

71 

69 

67 

66 

109 

.503 

89 

88 

86 

85 

83 

82 

80 

79 

77 

76 

74 

72 

71 

69 

67 

110 

2.576 

90 

89 

87 

86 

85 

83 

82 

80 

79 

77 

75 

74 

72 

70 

68 

111 

.652 

91 

90 

89 

87 

86 

84 

83 

81 

80 

78 

77 

75 

73 

72 

70 

112 

.730 

92 

91 

90 

88 

87 

86 

84 

83 

81' 

80 

78 

76 

75 

73 

71 

113 

.810 

94 

92 

91 

89 

88 

87 

85 

84 

82 

81 

79 

78 

76 

74 

72 

114 

.891 

95 

93 

92 

91 

89 

88 

86 

85 

83 

82 

80 

79 

77 

76 

74 

115 

2.975 

96 

94 

93 

92 

90 

89 

88 

86 

85 

83 

82 

80 

78 

77 

75 

116 

3.061 

97 

96 

94 

93 

91 

90 

89 

87 

86 

84 

83 

81 

80  I  78 

76 

117 

.148 

98 

97 

95 

94 

93 

91 

90 

88 

87 

86 

84 

83 

81 

79 

78 

118 

.239 

99 

98 

96 

95 

94 

92 

91 

90 

88 

87 

85 

84 

82 

81 

79 

119 

.331 

100 

99 

97 

96 

95 

93 

92 

91 

89 

88 

86 

85 

8.3 

82 

80 

120 

3.425 

101 

100 

99 

97 

96 

95 

93 

92 

90 

89 

88 

86 

85 

83 

82 

121 

.522 

102 

101 

100 

98 

97 

96 

94 

93 

92 

90 

89 

87 

86 

84* 

83 

122 

.621 

103 

102 

101 

99 

98 

97 

96 

94 

93 

91 

90 

89 

87 

86 

84 

123 

.723 

104 

103 

102 

101 

99 

98 

97 

95 

94 

93 

91 

90 

88 

87 

86 

124 

.827 

105 

104 

103 

102 

100 

99 

98 

96 

95 

94 

92 

91 

90 

88 

87 

125 

3.933 

106 

105 

104 

103 

101 

100 

99 

98 

96 

95 

94 

92 

91 

89 

88 

126 

4.042 

108 

106 

105 

104 

103 

101 

100 

99 

97 

96 

95 

93 

92 

90 

89 

127 

.154 

109 

107 

106 

105 

104 

102 

101 

100 

98 

97 

96 

94 

93 

92 

90 

128 

.268 

110 

108 

107 

106 

105 

103 

102 

101 

100 

98 

97 

96 

94 

93 

91 

129 

.385 

111 

110 

108 

107 

106 

105 

103 

102 

101 

99 

98 

97 

95 

94 

93 

130 

4.504 

112 

111 

109 

108 

107 

106 

104 

103 

102 

101 

99 

98 

97 

95 

94 

131 

.627 

113 

112 

110 

109 

108 

107 

105 

104 

103 

102 

100 

99 

98 

96 

95 

132 

.752 

114 

113 

111 

110 

109 

108 

107 

105 

104 

103 

101 

100 

99 

97 

96 

133 

4.  880 

115 

114 

113 

111 

110 

109 

108 

106 

105 

104 

103 

101 

100 

99 

97 

134 

6.011 

116 

115 

114 

112 

111 

110 

109 

108 

106 

105 

104 

102 

101 

100 

98 

135 

5.  145 

117 

116 

115 

113 

112 

111 

110 

109 

107 

106 

105 

104 

102 

101 

100 

136 

.282 

118 

117 

llfj 

115 

113 

112 

111 

110 

108 

107 

106 

105 

103 

102 

101 

137 

.422 

119 

118 

117 

116 

114 

113 

112 

111 

110 

108 

107 

106 

104 

103 

102 

138 

.565 

120 

119 

118 

117 

115 

114 

113 

112 

111 

109 

108 

107 

106 

104 

103 

139 

.712 

121 

120 

119 

118 

117 

115 

114 

113 

112 

110 

109 

108 

107 

105 

104 

140 

5.862 

122 

121 

120 

119 

118 

116 

115 

114 

113 

112 

110 

109 

108 

107 

105 

31 


TABLE  II. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  29.0  inches. 


Air 
emp. 
t 

Vapor 
press. 
e 

Depression  of  wet-bulb  thermometer  (t—f). 

31 

32 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

80 

1.022 

-19 

81 

.056 

Y 

-48 

82 

.091 

+  1 

-16 

S3 

.127 

7 

-  5 

-38 

84 

.163 

11 

+  2 

-14 

85 

1.201 

15 

8 

-  3 

-30 

86 

.241 

19 

12 

+  4 

-11 

87 

.281 

22 

17 

9 

-  2 

-24 

88 

.322 

25 

20 

14 

+  5 

-  8 

89 

.364 

28 

23 

17 

11 

±  0 

-19 

90 

1.408 

30 

26 

21 

15 

4-  7 

-  5 

-46 

91 

.453 

32 

28 

24 

19 

12 

+  3 

—14 

92 

.499 

35 

31 

27 

22 

16 

9 

-  3 

-30 

93 

.546 

37 

33 

29 

25 

20 

13 

+  5 

-10 

94 

.595 

39 

36 

32 

28 

23 

18 

10 

±  0 

-22 

95 

1.645 

41 

38 

34 

30 

26 

21 

15 

+  7 

-  6 

96 

.696 

43 

40 

37 

33 

29 

24 

19 

12 

+  2 

-16 

97 

.749 

45 

42 

39 

35 

31 

27 

23 

16 

9 

-  3 

-35 

98 

.803 

47 

44 

41 

38 

34 

30 

26 

20 

14 

+  5 

-11 

99 

.859 

49 

46 

43 

40 

36 

33 

29 

24 

18 

11 

±  0 

-24 

100 

1.916 

51 

48 

45 

42 

39 

35 

31 

27 

22 

16 

+  7 

-  6 

101 

1.  975 

52 

50 

47 

44 

41 

38 

34 

30 

25 

20 

13 

+  $ 

-15 

102 

2.035 

54 

52 

49 

46 

43 

40 

36 

32 

28 

23 

17 

10 

-  2 

—34 

103 

.097 

56 

53 

51 

48 

45 

42 

39 

35 

31 

27 

21 

15 

+  6 

-10 

104 

.160 

57 

55 

53 

50 

47 

44 

41 

38 

34 

30 

25 

19 

12 

+  1 

-21 

105 

2.225 

59 

57 

54 

52 

49 

46 

43 

40 

36 

32 

28 

23 

17 

9 

—  5 

106 

.292 

61 

58 

56 

54 

51 

48 

45 

42 

39 

35 

31 

26 

21 

14 

+  5 

107 

.360 

62 

60 

58 

55 

•53 

50 

48 

45 

41 

38 

34 

29 

25 

19 

11 

108 

.431 

64 

62 

59 

57 

55 

52 

50 

47 

44 

40 

36 

32 

28 

23 

16 

109 

.503 

65 

63 

61 

59 

56 

54 

51 

49 

46 

43 

39 

35 

31 

26 

^21 

110 

2.576 

66 

64 

62 

CO 

58 

56 

53 

51 

48 

45 

41 

38 

34 

29 

24 

111 

.652 

68 

66 

64 

62 

60 

58 

55 

53 

50 

47 

44 

40 

37 

32 

28 

112 

.730 

69 

67 

66 

64 

61 

59 

57 

54 

52 

49 

46 

43 

39 

35 

31 

113 

.810 

71 

69 

67 

65 

63 

61 

59 

56 

54 

51 

48 

45 

42 

38 

34 

114 

.891 

72 

70 

68 

66 

64 

62 

60 

58 

56 

53 

50 

47 

44 

41 

37 

115 

2.  975 

73 

72 

70 

68 

66 

64 

62 

60 

57 

55 

52 

49 

46 

43 

39 

116 

3.061 

75 

73 

71 

69 

67 

65 

63 

61 

59 

57 

54 

51 

48 

45 

42 

117 

.148 

76 

74 

73 

71 

69 

67 

65 

63 

61 

58 

56 

53 

51 

48 

44 

118 

.239 

77 

76 

74 

72 

70 

69 

67 

64 

62 

60 

58 

55 

53 

50 

47 

119 

.331 

79 

77 

75 

74 

72 

70 

68 

66 

64 

62 

60 

57 

55 

52 

49 

120 

3.425 

80 

78 

77 

75 

73 

71 

70 

68 

66 

63 

61 

59 

56 

54 

51 

121 

.522 

81 

80 

78 

76 

75 

73 

71 

69 

67 

65 

63 

61 

58 

56 

53 

122 

.621 

83 

81 

79 

78 

76 

74 

72 

70 

69 

67 

65 

62 

60 

5§ 

55 

123 

.723 

84 

82 

81 

79 

77 

76 

74 

72 

70 

68 

66 

64 

62 

59 

67 

124 

.827 

85 

84 

82 

80 

79 

77 

75 

73 

72 

70 

68 

66 

63 

61 

59 

125 

3.  933 

86 

85 

83 

82 

80 

78 

77 

75 

73 

71 

69 

67 

65 

63 

61 

126 

4.  042 

88 

86 

84 

83 

81 

80 

78 

76 

74 

72 

71 

69 

67 

65 

62 

127 

.154 

89 

87 

86 

84 

83 

81 

79 

78 

76 

74 

72 

70 

68 

66 

64 

128 

.268 

90 

88 

87 

85 

84 

82 

81 

79 

77 

75 

74 

72 

70 

68 

66 

129 

.385 

91 

90 

88 

87 

85 

84 

82 

80 

79 

77 

75 

73 

71 

69 

67 

130 

4.504 

92 

91 

89 

88 

86 

85 

83 

82 

80 

78 

77 

75 

73 

71 

69 

131 

.627 

94 

92 

91 

89 

88 

86 

85 

83 

81 

80 

78 

76 

74 

73 

71 

132 

.752 

95 

93 

92 

90 

89 

87 

86 

84 

83 

81 

79 

78 

76 

74 

72 

133 

4.880 

96 

94 

93 

92 

90 

89 

87 

86 

84 

82 

81 

79 

77 

75 

74 

134 

5.011 

97 

96 

94 

93 

91 

90 

88 

87 

85 

84 

82 

80 

79 

77 

75 

135 

5.145 

98 

97 

95 

94 

93 

91 

90 

88 

87 

85 

83 

82 

80 

78 

76 

136 

.282 

99 

98 

97 

95 

94 

92 

91 

89 

88 

86 

85 

83 

81 

80 

78 

137 

.422 

101 

99 

98 

96 

95 

94 

92 

91 

89 

88 

86 

84 

83 

81 

79 

138 

.565 

102 

100 

99 

98 

96 

95 

93 

92 

90 

89 

87 

86 

84 

82 

81 

139 

.712 

103 

101 

100 

99 

97 

96 

95 

93 

92 

90 

89 

87 

85 

84 

82 

140 

5.862 

104 

103 

101 

100 

99 

97 

96 

94 

93 

91 

90 

88 

87 

85 

84 

TABLE  II. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure=29.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t—f). 

46 

47 

48 

49 

50 

51 

52 

53 

54 

55 

56 

57 

58 

59 

60 

105 

-60 

106 

-13 

107 

-  1 

-28 

108 

+  8 

-  7 

109 

13 

+  3 

-16 

110 

18 

10 

-  2 

-36 

111 

23 

16 

+  7 

-  9 

112 

26 

21 

13 

+  2 

-20 

113 

29 

24 

18 

10 

-  3 

-52 

114 

32 

28 

23 

15 

+  6 

-11 

115 

35 

31 

26 

20 

13 

+  2 

-23 

116 

38 

34 

30 

24 

18 

10 

-  4 

117 

41 

37 

33 

28 

23 

16 

+  6 

-12 

118 

43 

40 

36 

31 

27 

21 

13 

+  1 

-26 

119 

46 

42 

39 

34 

30 

25 

19 

10 

-  5 

120 

48 

45 

41 

37 

33 

28 

23 

16 

+  6 

-13 

121 

50 

47 

44 

40 

36 

32 

27 

21 

13 

+  1 

-28 

122 

52 

49 

46 

43 

39 

35 

30 

25 

19 

10 

-  5 

123 

54 

52 

49 

45 

42 

38 

33 

29 

23 

16 

+  6 

-13 

124 

56 

54 

51 

48 

44 

41 

36 

32 

27 

21 

13 

+  1 

-29 

125 

58 

56 

53 

50 

47 

43 

39 

35 

31 

25 

19 

10 

-  5 

126 

60 

58 

55 

52 

49 

46 

42 

38 

34 

29 

23 

16 

+  6 

-13 

127 

62 

59 

57 

54 

51 

48 

45 

41 

37 

32 

27 

21 

13 

+  2 

-28 

128 

64 

61 

59 

56 

54 

51 

47 

44 

40 

36 

31 

26 

19 

10 

-  4 

129 

65 

63 

61 

58 

56 

53 

50 

46 

43 

39 

34 

29 

24 

17 

+  7 

130 

67 

65 

62 

CO 

58 

55 

52 

49 

46 

42 

38 

33 

28 

22 

14 

131 

69 

66 

64 

62 

59 

57 

54 

51 

48 

45 

41 

36 

32 

26 

20 

132 

70 

68 

66 

64 

61 

59 

56 

53 

50 

47 

44 

40 

35 

30 

25 

133 

72 

70 

68 

65 

63 

61 

58 

56 

53 

50 

46 

43 

38 

34 

29 

134 

73 

71 

69 

67 

65 

63 

60 

58 

55 

52 

49 

45 

41 

37 

32 

135 

75 

73 

71 

69 

67 

64 

62 

60 

57 

54 

51 

48 

44 

40 

36 

136 

76 

74 

72 

70 

68 

66 

64 

61 

59 

56 

53 

50 

47 

43 

39 

187 

78 

76 

74 

72 

70 

68 

66 

63 

61 

58 

56 

53 

49 

46 

42 

138 

79 

77 

75 

74 

72 

69 

67 

65 

63 

60 

58 

55 

52 

49 

45 

139 

80 

79 

77 

75 

73 

71 

69 

67 

64 

62 

60 

57 

54 

51 

48 

140 

82 

80 

78 

77 

75 

73 

71 

69 

66 

64 

62 

59 

56 

53 

50 

33 


TABLE  ILL  — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  27.0  inches. 


Air. 
temp. 
t 

Vapor 
press. 
e 

Depression  of  wet-bulb  thermometei  (i  —  t'). 

.2 

.4 

.6 

.8 

1.0   1.2 

1.4 

1.6 

1.8 

2.0   2.2 

2.4 

2.6 

3.8 

3.0 

-40 
-39 

.0039 
41 

-50 
-49 

g 

(<-/') 

—38 
-37 

44 

46 

—48 

-47 

t 

6 

t 

.1 

.2 

.3 

.4 

.5 

gg 

48 

—45 

( 

-35 

.0051 

-44 

-68 

-60 

.0010 

—51 

0019 

-60 

-34 

54 

-42 

-55 

—59 

11 

-50 

0021 

-59 

-33 

57 

-40 

-52 

—58 

12 

-49 

22 

-57 

-32 

61 

-39 

-50 

—57 

13 

-48 

24 

-55 

-31 

65 

-37 

-47 

—56 

13 

-47 

26 

-54 

-55 

.0015 

-46 

27 

-62 

-30 

-29 
-28 
—27 

.0069 
74 
78 
83 

-35 
-34 
-32 
-31 

—45 
-42 

—40 
-:{8 

Qfi 

-57 
-52 
—49 

A  & 

-54 
-53 

-52 

16 
17 
.0018 

-45 
-44 

—43 
—42 

.0029 
31 
33 
35 

-50 

-49 
-48 

47 

-60 
-58 
-56 
54 

89 

—  30 

j 

-41 

37 

-46 

-52 

-25 

.0094 

-29 

-34 

-43 

-58 

f 

-40 

.0039 

-45 

-50 

-60 

-24 

.0100 

-28 

-33 

-40 

-52 

-39 

41 

-44 

-49 

-58 

-23 

106 

-27 

-31 

-38 

-48 

-38 

44 

-42 

-48 

-56 

-22 

112 

-25 

—30 

-35 

-44 

-59 

-37 

46 

-41 

-47 

-54 

-21 

119 

-24 

-28 

-33 

-41 

-53 

-36 

48 

-40 

-45 

-51 

-20 
-19 
-18 
-17 
-16 

.0126 
133 
141 
150 
159 

-23 
—22 
-21 
—20 
-18 

-27 
-26 
-24 
-23 
-21 

-31 
-30 

-28 
-26 
-25 

-38 
-35 
-33 
-31 
-29 

-48 
-44 
-40 
-37 
-34 

-54 
-48 
-43 

-58 

-35 
-34 
-33 
-32 
-31 
-30 

.0051 
54 
57 
61 
65 
.0069 

-39 
-38 
-36 
—35 
-34 
-32 

-44 
-42 
-40 
-39 
-37 
-36 

-49 
-47 
-46 
-44 
-42 
-40 

-58 
-56 

-52 
-50 
-47 
-45 

-59 
-55 
-51 

•  15 

.0168 

—17 

20 

23 

-27 

-32 

-39 

-50 

-14 

178 

-16 

-19 

-22 

-25 

-29 

-35 

-45 

-13 

188 

-15 

-18 

-20 

-23 

-27 

-32 

-40 

-52 

-12 

199 

-14 

-16 

-19 

-22 

-25 

-30 

—36 

-46 

-11 

210 

-13 

-15 

-18 

-20 

-23 

-27 

-33 

-40 

-54 

-10 

.0222 

-12 

-14 

-16 

-19 

-22 

-25 

-30 

-36 

-46 

_  9 

234 

-11 

-13 

—  15 

-17 

-20 

-23 

-27 

-32 

-40 

-53 

—  8 

247 

-10 

-12 

-14 

-16 

-18 

-21 

-25 

-29 

-36 

-45 

-  7 

260 

-  9 

-10 

-12 

-15 

-17 

-20 

-23 

-27 

-32 

-39 

-60 

—  6 

275 

-  8 

-  9 

-11 

-13 

-15 

-18 

-21 

-24 

-29 

-34 

-43 

-60 

—  5 

.0291 

_  7 

-  8 

-10 

-12 

-14 

-16 

-19 

-22 

-26 

-31 

-37 

-49 

A 

307 

-  5 

-  7 

-  9 

-10 

-12 

-15 

-17 

-20 

-23 

-27 

-32 

-41 

—66 

-  3 

325 

-  4 

—  6 

-  7 

-  9 

—11 

-13 

-15 

-18 

-21 

-24 

-29 

-35 

-46 

-  2 

344 

-  3 

-  5 

-  6 

-  8 

-10 

-11 

-14 

-16 

-19 

-22 

-26 

-30 

-37 

-49 

-  1 

363 

-  2 

-  4 

-  5 

—  6 

-  8 

-10 

-12 

-14 

-17 

-19 

-23 

-27 

-32 

-40 

-64 

0 

.0383 

1 

-  2 

4 

—  5 

-  7 

-  8 

-10 

-12 

-15 

-17 

-20 

-23 

-28 

-33 

-42 

+  1 

403 

±  0 

-  1 

-  3 

-  4 

—  5 

-  7 

-  9 

-11 

-13 

-15 

-17 

-20 

-24 

-29 

-34 

2 

423 

+  1 

±  0 

'-  2 

-  3 

-  4 

-  6 

-  7 

g 

-11 

-13 

-15 

-18 

-21 

-25 

-29 

3 

444 

2 

+  1 

-  1 

-  2 

-  3 

-  4 

-  6 

-  7 

-  9 

-11 

-13 

-16 

-18 

-22 

-26 

4 

467 

3 

2 

+  1 

-  1 

-  2 

-  3 

—  4 

-  6 

-  8 

-  9 

-11 

-14 

-16 

-19 

-22 

5 

.0491 

4 

3 

2 

+  1 

-  1 

-  2 

-  3 

-  5 

-  6 

-  8 

-10 

-12 

-14 

-16 

-19 

6 

515 

5 

4 

3 

2 

+  1 

—  1 

-  2 

-  3 

-  5 

-  6 

-  8 

—10 

-12 

-14 

-17 

7 

542 

6 

5 

4 

3 

2 

+  1 

—  1 

-  2 

-  3 

-  5 

-  6 

-  8 

-10 

-12 

-14 

8 

570 

7 

6 

5 

4 

3 

2 

+  1 

-  1 

-  2 

-  3 

-  5 

-  6 

-  8 

-10 

-12 

9 

600 

8 

7 

6 

5 

4 

3 

2 

+  1 

-  1 

-  2 

-  3 

-  5 

-  6 

-  8 

-10 

10 

.0631 

9 

8 

7 

6 

5 

4 

3 

2 

+  1 

±  0 

-  2 

-  3 

-  4 

-  6 

-  8 

11 

665 

10 

9 

9 

8 

7 

6 

5 

4 

2 

+  1 

±  0 

-  2 

-  3 

-  4 

-  6 

12 

699 

11 

10 

10 

9 

8 

7 

6 

5 

4 

3 

+  1 

±  0 

-  1 

—  3 

-  4 

13 

735 

12 

11 

11 

10 

9 

8 

7 

6 

5 

4 

3 

+  2 

±  0 

-  1 

-  2 

14 

772 

13 

13 

12 

11 

10 

9 

8 

8 

7 

6 

4 

3 

+  2 

+  1 

-  2 

15 

.0810 

14 

14 

13 

12 

11 

10 

10 

9 

8 

7 

6 

5 

4 

2 

4  1 

16 

850 

15 

15 

14 

13 

12 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

17 

891 

16 

16 

15 

14 

13 

13 

12 

11 

10 

9 

9 

8 

7 

6 

5 

18 

933 

17 

17 

16 

15 

15 

14 

13 

12 

11 

11 

10 

9 

8 

7 

6 

19 

.0979 

18 

18 

17 

16 

16 

15 

14 

13 

13 

12 

11 

10 

9 

8 

8 

20 

.102G 

19 

19 

18 

17 

17 

16 

15 

15 

14 

13 

12 

11 

11 

10 

9 

9161°— 15 3 


TABLE  III. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  27.0  inches. 


Air 
temp. 
I 

Depression  of  wet-bulb  thermometer  (t  —  I'). 

3.2 

3.4 

3.6 

3.8 

4.0 

4.2 

4.4 

4.6 

4.8 

5.0 

5.2 

5.4 

5.6 

5.8 

6.0 

0 

-f  1 

-58 
-44 

(«-0 

3 

-30 

Of- 

-37 

-50 
39 

52 

6.2 

6.4 

6.6 

6.8 

7.0 

16 

51 

5 
6 
7 
8 

-23 
-20 
-17 
-14 

-27 
-23 
-20 
-17 

-32 
-27 
-23 
-20 

-40 
-33 
-28 
-24 

-56 
-42 
-34 

-28 

-60 
-44 
-34 

-45 

17 

18 
19 

-35 

-27 
-21 

-48 
-32 
-25 

-43 
-30 

-39 

—56 

9 

-12 

-14 

—17 

-20 

-24 

-29 

-34 

—45 

20 

-16 

-19 

-23 

-29 

-36 

10 
11 

-10 
-  8 

-12 

-10 

-14 

-12 

-17 
-14 

-20 
-17 

-24 
—20 

-28 
-24 

-35 
-28 

-46 
-35 

-46 

12 

-  6 

-  7 

-  9 

-11 

-14 

-16 

-19 

-23 

-28 

-34 

-45 

13 

-  4 

-  5 

-  7 

-  9 

-11 

—  13 

—16 

-19 

-23 

-27 

-33 

-44 

14 

—  2 

-  3 

-  5 

-  7 

-  9 

-11 

-13 

-16 

-18 

-22 

-26 

-32 

-42 

-60 

15 

4-   0 

-  2 

-  3 

—  5 

-  6 

-  8 

-10 

-12 

-15 

-18 

-21 

-26 

-31 

-40 

-57 

16 

+  2 

4-   0 

-  1 

—  3 

—  4 

—  6 

-  7 

-  9 

—  12 

-14 

-17 

-20 

-24 

-30 

-38 

17 

3 

+  2 

+  1 

-  1 

-  2 

-  3 

-   5 

-  7 

—  9 

-11 

-13 

-16 

-19 

-23 

-28 

18 

5 

4 

3 

+  1 

±  0 

_  1 

-  3 

_  4 

-  6 

-  8 

-10 

-13 

-15 

-18 

-22 

19 

6 

5 

4 

3 

+  2 

±  0 

-  1 

—  2 

—  4 

-  6 

—  7 

—  9 

-12 

-14 

-17 

20 

8 

7 

6 

5 

4 

+  2 

+  1 

±  0 

2 

-  3 

—  5 

—  7 

-  9 

-11 

-13 

35 


TABLE  III.  —Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  27.0  inches. 


Air 

emp. 
t 

Vapor 

press. 
e 

Bepression  of  wet-bulb  thermometer  (/—<')• 

.5 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

20 

0.103 

19 

17 

15 

13 

11 

9 

6 

4 

±  0 

-  3 

-  8 

-13 

-21 

-36 

21 

.108 

20 

18 

16 

14 

12 

10 

8 

5 

+  2 

-  1 

-  5 

-10 

-17 

-26 

-50 

22 

.113 

21 

19 

17 

15 

14 

12 

9 

7 

4 

+  1 

—  3 

-  7 

-13 

-20 

-33 

23 

.118 

22 

20 

18 

17 

15 

13 

11 

9 

6 

3 

-  1 

-  4 

-  9 

-16 

-25 

-47 

24 

.124 

23 

21 

20 

18 

16 

14 

12 

10 

8 

5 

+  2 

—  2 

—  6 

-12 

—19 

-31 

25 

0.130 

24 

22 

21 

19 

17 

16 

14 

12 

9 

7 

4 

±  0 

-  3 

-  8 

-14 

-23 

26 

.136 

25 

23 

22 

20 

19 

17 

15 

13 

11 

9 

6 

+  3 

-  1 

-  5 

-10 

-17 

27 

.143 

26 

24 

23 

22 

20 

18 

16 

14 

12 

10 

8 

5 

+  1 

o 

-  7 

-13 

28 

.150 

27 

26 

24 

23 

21 

20 

18 

16 

14 

12 

10 

7 

4 

±  0 

-  4 

-  9 

29 

.157 

28 

27 

25 

24 

22 

21 

19 

17 

15 

13 

11 

9 

6 

+  3 

1 

-  5 

30 

0.  164 

29 

28 

26 

25 

24 

22 

20 

19 

17 

15 

13 

11 

8 

5 

+  2 

__   Q 

31 

.172 

30 

29 

27 

26 

25 

23 

22 

20 

18 

17 

14 

12 

10 

7 

4 

+  1 

32 

.180 

31 

30 

28 

27 

26 

24 

23 

21 

20 

18 

16 

14 

12 

9 

7 

3 

33 

.187 

32 

31 

30 

28 

27 

26 

24 

23 

21 

20 

18 

16 

14 

11 

9 

6 

34 

.195 

33 

32 

31 

29 

28 

27 

r 

24 

23 

21 

19 

17 

15 

13 

11 

8 

35 

0.203 

34 

33 

32 

30 

29 

28 

27 

25 

24 

22 

21 

19 

17 

15 

13 

10 

36 

.211 

35 

34 

33 

31 

30 

29 

28 

27 

25 

24 

22 

20 

19 

17 

14 

12 

37 

.219 

36 

35 

34 

32 

31 

30 

29 

28 

26 

25 

24 

22 

20 

18 

16 

14 

38 

.228 

37 

36 

35 

33 

32 

31 

30 

29 

27 

26 

25 

23 

22 

20 

18 

16 

39 

.237 

38 

37 

36 

35 

33 

32 

31 

30 

29 

27 

26 

25 

23 

22 

20 

18 

40 

0.247 

39 

38 

37 

36 

34 

33 

32 

31 

30 

29 

27 

26 

24 

23 

21 

20 

41 

.256 

40 

39 

38 

37 

36 

34 

33 

32 

31 

30 

28 

27 

26 

24 

23 

21 

42 

.266 

41 

40 

39 

38 

37 

36 

34 

33 

32 

31 

29 

28 

27 

26 

24 

23 

43 

.277 

42 

41 

40 

39 

38 

37 

36 

34 

33 

32 

31 

29 

28 

27 

25 

24 

44 

.287 

43 

42 

41 

40 

39 

38 

37 

35 

34 

33 

32 

31 

29 

28 

27 

25 

45 

'  0.  298 

44 

43 

42 

41 

40 

39 

38 

37 

35 

34 

33 

32 

31 

29 

28 

27 

46 

.310 

45 

44 

43 

42 

41 

40 

39 

38 

37 

35 

34 

33 

32 

31 

29 

28 

47 

.322 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

35 

34 

33 

32 

30 

29 

48 

.334 

47 

46 

45 

44 

43 

42 

41 

40 

3!) 

38 

37 

35 

34 

33 

32 

30 

49 

.347 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

35 

34 

33 

32 

50 

0.360 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

34 

33 

51 

.373 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

34 

52 

.387 

51 

50 

49 

48 

47 

47 

46 

45 

44 

43 

42 

40 

39 

38 

37 

36 

53 

.402 

52 

51 

50 

50 

49 

48 

47 

46 

45 

44 

43 

42 

40 

39 

38 

37 

54 

.417 

53 

52 

51 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

39 

38 

55 

0.  432 

54 

53 

52 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

5« 

.448 

55 

54 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

57 

.465 

56 

55 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

58 

.482 

57 

56 

56 

65 

54 

53 

52 

51 

60 

49 

48 

47 

46 

45 

44 

43 

59 

.499 

58 

57 

57 

56 

55 

54 

53 

52 

51 

50 

50 

49 

48 

47 

46 

45 

60 

0.517 

59 

58 

58 

57 

56 

55 

54 

53 

53 

52 

51 

50 

49 

48 

47 

46 

61 

.536 

60 

59 

59 

58 

57 

56 

55 

54 

64' 

53 

52 

51 

50 

49 

48 

47 

62 

.  555 

61 

60 

60 

59 

58 

57 

56 

56 

55 

54 

53 

52 

51 

50 

49 

48 

63 

.575 

62 

61 

61 

60 

59 

58 

57 

57 

56 

55 

54 

53 

52 

51 

50 

49 

64 

.595 

63 

62 

62 

61 

60 

59 

59 

58 

57 

56 

55 

54 

53 

53 

52 

51 

65 

0.616 

64 

64 

63 

62 

61 

60 

60 

59 

58 

57 

56 

55 

54 

54 

53 

52 

66 

.638 

65 

65 

64 

63 

62 

61 

61 

60 

59 

58 

57 

57 

56 

55 

54 

53 

67 

.661 

66 

66 

65 

64 

63 

62 

62 

61 

60 

59 

58 

58 

57 

56 

55 

54 

68 

.684 

67 

67 

66 

65 

64 

64 

63 

62 

61 

60 

60 

59 

58 

57 

56 

55 

69 

.707 

68 

68 

67 

66 

65 

65 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

70 

0.732 

69 

69 

68 

67 

66 

66 

65 

64 

63 

63 

62 

61 

60 

59 

58 

58 

71 

.757 

70 

70 

69 

68 

67 

67 

66 

65 

64 

64 

63 

62 

61 

60 

60 

59 

72 

.783 

71 

71 

70 

69 

68 

68 

67 

66 

65 

65 

64 

63 

62 

62 

61 

60 

73 

.810 

72 

72 

71 

70 

69 

69 

68 

67 

66 

66 

65 

64 

63 

63 

62 

61 

74 

.838 

73 

73 

72 

71 

71 

70 

69 

68 

68 

67 

66 

65 

64 

64 

63 

62 

76 

0.866 

74 

74 

73 

72 

72 

71 

70 

69 

69 

68 

67 

66 

66 

65 

64 

63 

76 

.89(5 

75 

75 

74 

73 

73 

72 

71 

70 

70 

69 

68 

67 

67 

66 

65 

64 

77 

.926 

76 

76 

75 

74 

74 

73 

72 

72 

71 

70 

69 

68 

67 

66 

65 

78 

.957 

77 

77 

76 

75 

75 

74 

73 

73 

72 

71 

70 

70 

69 

68 

67 

67 

79 

0.  989 

78 

78 

77 

76 

76 

75 

74 

74 

73 

72 

71 

71 

70 

69 

68 

68 

80 

1.022 

79 

79 

78 

77 

77 

76 

75 

75 

74 

73 

72 

72 

71 

70 

70 

69 

36 


TABLE  III. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  27.0  inches. 


Air 

t«np. 
t 

Vapor 
press. 
e 

Depression  of  wet-bulb  thermometer  (t—f). 

8.5 

9.0 

9.5 

10.0 

10.5 

11.0 

11.6 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

15.0 

15.5 

16.0 

26 

0.130 

-41 

26 

.136 

-28 

27 

.143 

-20 

-36 

28 

.150 

-15 

-25 

-48 

29 

.157 

-11 

-18 

-30 

30 

0.164 

-  7 

-13 

-21 

-39 

31 

.172 

—  3 

-  8 

-15 

-25 

-52 

32 

.180 

±  0 

-  4 

-10 

-18 

-30 

33 

.187 

+  3 

-  1 

-  6 

-12 

-20 

-36 

34 

.195 

5 

+  2 

-  2 

-  7 

-14 

-24 

-47 

35 

0.  203 

8 

4 

+  1 

—  3 

-  9 

-16 

-28 

36 

.211 

10 

7 

4 

±  o 

—  5 

—  10 

-18 

-33 

37 

.219 

12 

9 

6 

+  3 

-  1 

-  6 

-12 

-21 

-41 

38 

.228 

14 

11 

9 

6 

+  2 

2 

-  7 

-14 

-24 

-51 

39 

.237 

16 

13 

11 

8 

6 

+  1 

—  3 

-  8 

-16 

-27 

40 

0.247 

18 

15 

13 

11 

8 

5 

+  1 

-  4 

-10 

-17 

-32 

41 

.256 

19 

17 

15 

13 

10 

7 

4 

±  0 

-  5 

-11 

-20 

—36 

42 

.266 

21 

19 

17 

15 

13 

10 

7 

+  3 

-  1 

-  6 

-12 

-22 

—44 

43 

.277 

22 

21 

19 

17 

15 

12 

10 

7 

+  3 

-  1 

-  6 

-14 

-24 

-55 

44 

.287 

24 

22 

20 

18 

1C 

14 

12 

9 

6 

+  2 

2 

-  7 

-15 

-27 

45 

0.298 

25 

24 

22 

20 

18 

16 

14 

11 

9 

6 

+  2 

-  3 

-  8 

-16 

-30 

46 

.310 

26 

25 

?3 

22 

20 

18 

16 

13 

11 

8 

5 

+  1 

-  3 

-  9 

-18 

-83 

47 

.322 

28 

26 

25 

23 

22 

20 

18 

15 

13 

11 

8 

5 

+  1 

-  4 

-10 

-19 

48 

.334 

29 

28 

26 

25 

23 

21 

20 

17 

15 

13 

10 

8 

4 

±  0 

K 

-11 

49 

.347 

30 

29 

28 

26 

25 

23 

21 

19 

17 

15 

13 

10 

7 

+  4 

-  1 

-  5 

50 

0.360 

32 

30 

29 

28 

26 

25 

23 

21 

19 

17 

15 

13 

10 

7 

+  3 

-  1 

51 

.373 

33 

32 

30 

29 

28 

26 

25 

23 

21 

19 

17 

15 

12 

10 

6 

+  3 

52 

.387 

34 

33 

32 

30 

29 

28 

26 

24 

23 

21 

19 

17 

15 

12 

.  9 

6 

53 

.402 

36 

34 

33 

32 

30 

29 

28 

26 

24 

23 

21 

19 

17 

14 

12 

9 

54 

.417 

37 

36 

34 

33 

32 

30 

29 

28 

26 

24 

23 

21 

19 

17 

14 

12 

55 

0.  432 

38 

37 

36 

34 

33 

32 

30 

29 

28 

26 

24 

23 

21 

19 

17 

14 

56 

.448 

40 

38 

37 

36 

34 

33 

32 

30 

29 

28 

26 

24 

23 

21 

19 

17 

67 

.465 

41 

40 

39 

37 

36 

35 

33 

32 

31 

29 

28 

26 

24 

23 

21 

19 

58 

.482 

42 

41 

40 

39 

37 

36 

35 

33 

32 

31 

29 

28 

26 

24 

23 

21 

59 

.499 

43 

42 

41 

40 

39 

38 

36 

35 

33 

32 

31 

29 

28 

26 

24 

23 

60 

0.617 

45 

44 

43 

41 

40 

39 

38 

36 

35 

33 

32 

31 

29 

28 

26 

25 

61 

.536 

46 

45 

44 

43 

42 

40 

39 

38 

36 

35 

34 

32 

31 

29 

28 

26 

62 

.555 

47 

46 

46 

44 

43 

42 

41 

39 

38 

37 

35 

34 

32 

31 

30 

28 

63 

.575 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

34 

32 

31 

30 

64 

.595 

50 

49 

48 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

34 

33 

31 

65 

0.616 

51 

50 

49 

48 

47 

46 

45 

43 

42 

41 

40 

38 

37 

36 

34 

33 

66 

.K38 

52 

51 

50 

49 

48 

47 

46 

45 

44 

42 

41 

40 

39 

37 

36 

35 

67 

.661 

53 

52 

61 

50 

49 

48 

47 

46 

45 

44 

43 

42 

40 

39 

38 

36 

68 

.684 

54 

53 

53 

51 

51 

50 

49 

47 

46 

45 

44 

43 

42 

41 

39 

38 

69 

.707 

56 

55 

64 

53 

52 

51 

50 

49 

48 

47 

46 

44 

43 

42 

41 

39 

70 

0.732 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

42 

41 

71 

.757 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

42 

72 

.783 

69 

58 

57 

56 

55 

65 

54 

53 

52 

51 

50 

49 

47 

46 

45 

44 

73 

.810 

60 

59 

58 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

74 

.838 

61 

60 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

75 

0.866 

62 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

53 

52 

50 

'  49 

48 

76 

.896 

64 

63 

62 

61 

60 

59 

58 

57 

57 

56 

55 

54 

53 

52 

51 

50 

77 

.926 

65 

64 

63 

62 

61 

60 

60 

59 

58 

67 

56 

55 

54 

53 

52 

51 

78 

.957 

66 

65 

64 

63 

03 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

79 

.989 

67 

66 

65 

64 

64 

63 

62 

61 

60 

59 

58 

58 

57 

56 

55 

54 

80 

1.022 

68 

67 

66 

66 

65 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

55 

37 


TABLE  III. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  27.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t—  f). 

tfcinp. 

t 

16.  5 

17.0 

17.6 

18.0 

18.5 

19.0 

19.5 

20.0 

20.5 

21.0 

21.5 

22.0 

22.5 

23.0 

23.5 

24.0 

47 

-37 

48 

-20 

-42 

49 

-12 

-22 

-47 

50 

~  6 

-13 

-24 

-56 

51 

-  2 

-  7 

-14 

-26 

52 

+  2 

-  2 

-  8 

-16 

-29 

53 

6 

+  2 

-  3 

-  8 

-17 

-32 

54 

9 

6 

+  1 

—  3 

-  9 

-18 

-35 

55 

12 

9 

5 

+  1 

-  4 

-10 

-19 

-39 

56 

14 

12 

9 

5 

+  1 

-  4 

-11 

-20 

-44 

67 

16 

14 

11 

8 

5 

±  0 

-  5 

-12 

-22 

-49 

58 

19 

16 

14 

11 

8 

i  a 

±  o 

-  5 

-12 

-23 

-57 

59 

21 

19 

16 

14 

11 

8 

+  4 

±  0 

-  5 

-12 

-24 

60 

23 

21 

19 

16 

14 

11 

8 

+  4 

±  0 

—  6 

-13 

-25 

61 

25 

23 

21 

19 

16 

14 

11 

8 

+  4 

±  0 

-  6 

-14 

-26 

62 

26 

25 

23 

21 

19 

16 

14 

11 

8 

+  4 

-  1 

-  6 

-14 

-27 

63 

28 

27 

25 

23 

21 

19 

17 

14 

11 

8 

+  4 

-  1 

-  6 

-14 

-28 

64 

30 

28 

27 

25 

23 

21 

19 

17 

14 

11 

8 

+  4 

-  1 

—  6 

-15 

-^29 

65 

31 

30 

28 

27 

25 

23 

21 

19 

17 

14 

11 

8 

+  4 

_  1 

-  6 

-15 

66 

33 

32 

30 

29 

27 

25 

23 

21 

19 

17 

14 

11 

8 

+  4 

—  1 

—  6 

67 

35 

33 

32 

30 

29 

27 

25 

24 

22 

19 

17 

14 

11 

8 

+  4 

-  1 

68 

36 

35 

34 

32 

31 

29 

27 

26 

24 

22 

20 

17 

14 

12 

8 

+  4 

69 

38 

37 

35' 

34 

32 

31 

29 

27 

26 

24 

22 

20 

17 

15 

12 

9 

70 

40 

38 

37 

35 

34 

32 

31 

29 

28 

26 

24 

22 

20 

18 

15 

12 

71 

41 

40 

39 

37 

36 

34 

33 

31 

30 

28 

26 

24 

22 

20 

18 

16 

72 

43 

42 

40 

39 

38 

36 

34 

33 

31 

30 

28 

26 

24 

2:5 

20 

18 

73 

44 

43 

42 

40 

39 

38 

36 

35 

33 

32 

30 

28 

27 

25 

23 

21 

74 

46 

45 

43 

42 

41 

39 

38 

37 

35 

34 

32 

30 

29 

27 

25 

23 

75 

47 

46 

45 

44 

42 

41 

40 

38 

37 

35 

34 

32 

31 

29 

27 

25 

76 

49 

48 

46 

45 

44 

43 

41 

40 

39 

37 

36 

34 

32 

31 

29 

27 

77 

50 

49 

48 

47 

46 

44 

43 

42 

40 

39 

38 

36 

34 

33 

31 

30 

78 

51 

50 

49 

48 

47 

46 

45 

43 

42 

41 

39 

38 

36 

35 

33 

32 

79 

53 

52 

51 

50 

49 

47 

46 

45 

44 

42 

41 

40 

38 

37 

35 

34 

80 

54 

53 

52 

51 

50 

49 

48 

46 

45 

44 

43 

42 

40 

39 

37 

36 

I 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

24.5 

25.0 

25.5 

26.0 

26.5 

27.0 

27.5 

28.0 

28.5 

29.0 

29.5 

30.0 

30.5 

31.0 

31.5 

32.0 

65 

-29 

~~ 

66 

—15 

-30 

67 

-  6 

-15 

-30 

68 

±  o 

—  6 

-15 

-30 

69 

+  5 

±  0 

-  6 

-15 

-30 

70 

9 

+  5 

±  0 

+  6 

-14 

-30 

71 

12 

9 

+  5 

±  0 

—  6 

-14 

-29 

72 

15 

12 

9 

+  5 

±  0 

R 

-14 

-28 

73 

18 

16 

13 

10 

+  6 

+  1 

-  5 

-13 

-27 

74 

21 

19 

16 

13 

10 

6 

+  1 

-  4 

-12 

-26 

75 

23 

21 

19 

16 

13 

10 

6 

+  2 

-  4 

-12 

-25 

76 

26 

24 

22 

19 

16 

14 

11 

7 

+  2 

-  4 

-11 

-24 

77 

28 

26 

24 

22 

20 

17 

14 

11 

7 

+  3 

-  3 

-11 

-23 

78 

30 

28 

26 

24 

22 

20 

17 

14 

11 

8 

+  3 

-  2 

-10 

-21 

79 

32 

30 

28 

27 

25 

23 

20 

18 

15 

12 

8 

+  4 

-  2 

—  9 

-20 

-54 

£0 

34 

32 

31 

29 

27 

25 

23 

21 

18 

15 

12 

9 

+  4 

-  1 

—  8 

-18 

38 


TABLE  III. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  27.0  inches. 


Air 
temp. 

Vapor 

press. 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

t 

e 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

80 

1.022 

79 

77 

76 

75 

73- 

72 

70 

69 

67 

66 

64 

62 

61 

59 

57 

55 

81 

.056 

80 

78 

77 

7<; 

74 

73 

71 

70 

68 

67 

65 

64 

62 

60 

58 

68 

82 

.091 

81 

79 

78 

77 

75 

74 

72 

71 

69 

68 

66 

65 

63 

61 

60 

58 

83 

.127 

82 

80 

79 

78 

76 

75 

74 

72 

71 

69 

67 

66 

64 

62 

61 

59 

84 

.163 

83 

81 

80 

79 

77 

76 

75 

73 

72 

70 

69 

67 

65 

64 

62 

60 

85 

1.201 

84 

82 

81 

80 

78 

77 

76 

74 

73 

71 

70 

68 

67 

65 

63 

61 

86 

.241 

85 

83 

82 

81 

80 

78 

77 

75 

74 

72 

71 

69 

68 

6J3 

64 

63 

87 

.281 

86 

84 

83 

82 

81 

79 

78 

76 

75 

74 

72 

70 

69 

57 

66 

64 

88 

.  322 

87 

85 

84 

83 

82 

80 

79 

77 

76 

75 

73 

72 

70 

69 

67 

65 

89 

.364 

88 

86 

85 

84 

83 

81 

80 

79 

77 

76 

74 

73 

71 

70 

68 

66 

90 

1.408 

89 

88 

86 

85 

84 

82 

81 

80 

78 

77 

75 

74 

72 

71 

69 

68 

91 

.  453 

90 

89 

87 

86 

85 

83 

82 

81 

79 

78 

76 

75 

74 

72 

70 

69 

92 

.499 

91 

90 

88 

87 

86 

84 

83 

82 

80 

79 

78 

76 

75 

73 

72 

70 

93 

.546 

92 

91 

89 

88 

87 

85 

84 

83 

81 

80 

79 

77 

76 

74 

73 

71 

94 

.595 

93 

92 

90 

89 

88 

87 

85 

84 

82 

81 

80 

78 

77 

75 

74 

72 

95 

1.645 

94 

93 

91 

90 

89 

88 

86 

85 

84 

82 

81 

80 

78 

77 

75 

74 

96 

.696 

95 

94 

92 

91 

90 

89 

87 

86 

85 

83 

82 

81 

79 

78 

76 

75 

97 

.749 

96 

95 

93 

92 

91 

90 

88 

87 

86 

84 

83 

82 

80 

79 

77 

76 

98 

.803 

97 

96 

94 

93 

92 

91 

89 

88 

87 

85 

84 

83 

81 

80 

79 

77 

99 

.859 

98 

97 

95 

94 

93 

92 

90 

89 

88 

87 

85 

84 

82 

81 

80 

78 

100 

1.916 

99 

98 

96 

95 

94 

93 

91 

90 

89 

88 

86 

85 

84 

82 

81 

79 

101 

1.975 

100 

99 

97 

96 

95 

94 

92 

91 

90 

89 

87 

86 

85 

83 

82 

80 

102 

2.  035 

101 

100 

98 

97 

96 

95 

94 

92 

91 

90 

88 

87 

86 

84 

83 

82 

103 

.097 

102 

101 

99 

98 

97 

96 

95 

93 

92 

91 

90 

88 

87 

85 

84 

83 

104 

.160 

103 

102 

100 

99 

98 

97 

96 

94 

93 

92 

91 

89 

88 

87 

85 

84 

105 

2.225 

104 

103 

101 

100 

99 

98 

97 

95 

94 

93 

92 

90 

89 

88 

86 

85 

106 

.292 

105 

104 

102 

101 

100 

99 

98' 

96 

95 

94 

93 

91 

90 

89 

87 

86 

107 

.360 

106 

105 

104 

102 

101 

100 

99 

98 

96 

95 

94 

92 

91 

90 

89 

87 

108 

.4H1 

107 

106 

105 

103 

102 

101 

100 

99 

97 

96 

95 

94 

92 

91 

90 

88 

109 

.503 

108 

107 

106 

104 

103 

102 

101 

100 

98 

97 

96 

95 

93 

92 

91 

89 

110 

2.576 

109 

108 

107 

105 

104 

103 

102 

101 

99 

98 

97 

96 

94 

93 

92 

90 

111 

.652 

110 

109 

108 

106 

105 

104 

103 

102 

100 

99 

98 

97 

95 

94 

93 

92 

112 

.730 

111 

110 

109 

107 

106 

105 

104 

103 

101 

100 

99 

98 

97 

95 

94 

93 

113 

.810 

112 

111 

110 

108 

107 

106 

105 

104 

102 

101 

100 

99 

98 

96 

95 

94 

114 

.891 

113 

112 

111 

109 

108 

107 

106 

105 

104 

102 

101 

100 

99 

97 

96 

95 

115 

2.  975 

114 

113 

112 

110 

109 

108 

107 

106 

105 

103 

102 

101 

100 

98 

97 

96 

116 

3.  Olil 

115 

114 

113 

111 

110 

109 

108 

107 

106 

104 

10:5 

102 

101 

100 

98 

97 

117 

.148 

116 

115 

114 

112 

111 

110 

109 

108 

107 

105 

104 

103 

102 

101 

99 

98 

118 

.*39 

117 

116 

115 

114 

112 

111 

110 

109 

108 

107 

105 

104 

103 

102 

100 

99 

119 

.331 

118 

117 

116 

115 

113 

112 

111 

110 

109 

108 

106 

105 

104 

103 

101 

100 

120 

3.425 

119 

118 

117 

116 

114 

113 

112 

111 

110 

109 

107 

10*i 

105 

104 

103 

101 

121 

.  522 

120 

119 

118 

117 

115 

114 

113 

112 

111 

110 

108 

107 

106 

105 

104 

102 

122 

.621 

121 

120 

119 

118 

116 

115 

114 

113 

112 

111 

101) 

108 

107 

106 

105 

10:? 

123 

.723 

122 

121 

120 

119 

117 

116 

115 

114 

113 

112 

111 

109 

108 

107 

106 

105 

124 

.827 

123 

122 

121 

120 

118 

117 

116 

115 

114 

113 

112 

110 

109 

108 

107 

106 

125 

3.933 

124 

123 

122 

121 

119 

118 

117 

116 

115 

114 

113 

111 

110 

109 

108 

107 

126 

4.042 

125 

124 

123 

122 

120 

119 

118 

117 

116 

115 

114 

112 

111 

110 

109 

108 

127 

.154 

126 

125 

124 

123 

121 

120 

119 

118 

117 

116 

115 

114 

112 

111 

110 

109 

128 

.268 

127 

126 

125 

124 

122 

121 

120 

119 

118 

117 

116 

115 

113 

112 

111 

110 

129 

.385 

128 

127 

126 

125 

124 

122 

121 

120 

119 

118 

117 

116 

114 

113 

112 

111 

130 

4.504 

129 

128 

127 

126 

125 

123 

122 

121 

120 

119 

118 

117 

115 

114 

113 

112 

131 

.627 

130 

129 

128 

127 

126 

124 

123 

122 

121 

120 

119 

118 

116 

115 

114 

113 

132 

.752 

131 

130 

129 

128 

127 

125 

124 

123 

122 

121 

120 

119 

118 

116 

115 

114 

133 

4.880 

132 

131 

130 

129 

128 

126 

125 

124 

123 

122 

121 

120 

119 

117 

116 

115 

134 

5.011 

133 

132 

131 

130 

129 

127 

126 

125 

124 

123 

122 

121 

120 

118 

117 

116 

135 

5.145 

134 

133 

132 

131 

130 

128 

127 

126 

125 

124 

123 

122 

121 

119 

118 

117 

136 

.282 

135 

134 

133 

132 

131 

129 

128 

127 

126 

125 

124 

123 

122 

121 

119 

118 

137 

.  422 

13fi 

135 

134 

133 

132 

130 

129 

128 

127 

126 

125 

124 

123 

122 

120 

119 

138 

.  5(>5 

137 

136 

135 

134 

133 

132 

130 

129 

128 

127 

126 

125 

124 

123 

121 

120 

139 

.712 

138 

137 

136 

135 

134 

133 

131 

130 

129 

128 

127 

126 

125 

124 

122 

121 

140 

5.862 

139 

138 

137 

136 

135 

134 

l:>,2 

131 

130 

129 

128 

127 

126 

125 

124 

122 

39 


TABLE  III. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  27.0  inches. 


Air 
temp. 

Vapor 
press. 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

t 

e 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

80 

1.022 

53 

51 

49 

46 

44 

42 

39 

36 

32 

29 

25 

21 

15 

9 

—  1 

—18 

81 

.056 

54 

52 

50 

48 

46 

43 

40 

37 

34 

31 

27 

23 

18 

13 

+  5 

1 

82 

.091 

56 

54 

52 

50 

47 

45 

42 

39 

36 

33 

30 

26 

21 

16 

10 

-4-  0 

63 

.127 

57 

55 

53 

51 

49 

46 

44 

41 

38 

35 

32 

28 

24 

19 

14 

+  6 

84 

.163 

58 

56 

54 

52 

50 

48 

45 

43 

40 

37 

34 

30 

27 

22 

17 

11 

85 

1.201 

60 

58 

56 

54 

52 

50 

47 

44 

42 

39 

36 

32 

29 

25 

21 

15 

86 

.241 

61 

59 

57 

55 

53 

51 

49 

46 

44 

41 

38 

35 

31 

28 

23 

19 

87 

.281 

62 

60 

59 

57 

55 

52 

50 

48 

45 

43 

40 

37 

33 

30 

26 

22 

88 

.322 

63 

62 

bO 

58 

56 

54 

52 

49 

47 

44 

42 

39 

35 

32 

28 

24 

89 

.364 

65 

63 

61 

59 

57 

55 

53 

51 

49 

46 

43 

41 

38 

34 

31 

27 

90 

1.408 

66 

64 

62 

61 

59 

57 

55 

53 

50 

48 

45 

43 

40 

36 

33 

29 

91 

.453 

67 

01) 

64 

62 

60 

58 

/56 

51 

52 

50 

47 

44 

42 

39 

35 

32 

92 

.499 

68 

67 

65 

63 

61 

60 

*58 

56 

53 

51 

49 

46 

44 

41 

37 

34 

93 

.546 

70 

68 

66 

65 

63 

61 

59 

57 

55 

53 

50 

48 

45 

43 

40 

36 

94 

.595 

71 

69 

68 

66 

64 

62 

60 

58 

56 

54 

52 

50 

47 

44 

42 

38 

95 

1.  645 

72 

70 

69 

67 

65 

64 

62 

60 

58 

56 

54 

51 

49 

46 

44 

41 

96 

.696 

73 

72 

70 

68 

67 

65 

63 

61 

59 

57 

55 

53 

50 

48 

45 

43 

97 

.749 

74 

73 

71 

70 

68 

66 

64 

63 

61 

59 

57 

54 

52 

50 

47 

44 

98 

.  803 

76 

74 

72 

71 

69 

68 

66 

64 

62 

60 

58 

56 

54 

52 

49 

46 

99 

.859 

77 

75 

74 

72 

70 

69 

67 

65 

63 

62 

60 

58 

55 

53 

51 

48 

100 

1.916 

78 

76 

75 

73 

72 

70 

68 

67 

65 

63 

61 

59 

57 

55 

52 

50 

101 

1.975 

79 

78 

76 

74 

73 

71 

70 

68 

66 

64 

62 

60 

58 

56 

54 

52 

102 

2.035 

80 

79 

77 

76 

74 

72 

71 

69 

67 

66 

64 

62 

60 

58 

56 

53 

103 

.097 

81 

80 

78 

77 

75 

74 

72 

70 

69 

67 

65 

63 

61 

59 

57 

55 

104 

.160 

82 

81 

80 

78 

77 

75 

73 

72 

70 

68 

67 

65 

63 

61 

59 

57 

105 

2.225 

84 

82 

81 

80 

78 

76 

75 

73 

71 

70 

68 

66 

64 

62 

60 

58 

106 

.292 

85 

83 

82 

81 

79 

77 

76 

74 

73 

71 

69 

68 

66 

64 

62 

60 

107 

.360 

86 

84 

83 

82 

80 

79 

77 

76 

74 

72 

71 

69 

67 

65 

63 

61 

108 

.431 

87 

86 

84 

83 

81 

80 

78 

77 

75 

74 

72 

70 

68 

67 

65 

63 

109 

.503 

88 

87 

85 

84 

82 

81 

80 

78 

76 

75 

73 

71 

70 

68 

66 

64 

110 

2.576 

89 

88 

86 

85 

84 

82 

81 

79 

78 

76 

74 

73 

71 

69 

68 

6f 

111 

.652 

90 

89 

88 

86 

85 

&3 

82 

80 

79 

77 

76 

74 

72 

71 

69 

67 

112 

.730 

91 

90 

89 

87 

86 

84 

83 

82 

80 

79 

77 

75 

74 

72 

70 

68 

113 

.810 

92 

91 

90 

88 

87 

86 

84 

83 

81 

80 

78 

77 

75 

73 

72 

70 

114 

.891 

94 

92 

91 

90 

88 

87 

85 

84 

82 

81 

80 

78 

76 

75 

73 

71 

115 

2.975 

95 

93 

92 

91 

89 

88 

87 

85 

84 

82 

81 

79 

78 

76 

74 

73 

116 

3.061 

96 

94 

93 

92 

90 

89 

88 

86 

85 

83 

82 

80 

79 

77 

76 

74 

117 

.148 

97 

96 

94 

93 

92 

90 

89 

87 

86 

85 

83 

82 

80 

78 

77 

75 

118 

.239 

98 

97 

95 

94 

93 

91 

90 

89 

87 

86 

84 

83 

81 

80 

78 

77 

119 

.331 

99 

98 

96 

95 

94 

92 

91 

90 

88 

87 

86 

84 

83 

81 

79 

78 

120 

3.425 

100 

99 

98 

96 

95 

94 

92 

91 

90 

88 

87 

85 

84 

82 

81 

79 

121 

.  522 

101 

100 

99 

97 

96 

95 

93 

92 

91 

89 

88 

86 

85 

83 

82 

80 

122 

.621 

102 

101 

100 

98 

97 

96 

95 

93 

92 

90 

89 

88' 

86 

85 

83 

82 

123 

.723 

103 

102 

101 

100 

98 

97 

96 

94 

93 

92 

90 

89 

87 

86 

84 

83 

124 

.827 

104 

103 

102 

101 

99 

98 

97 

95 

94 

93 

91 

90 

89 

87 

86 

84 

125 

3.933 

105 

104 

103 

102 

100 

99 

98 

97 

95 

94 

93 

91 

90 

88 

87 

85 

126 

4.  042 

107 

105 

104 

103 

102 

100 

99 

98 

96 

95 

94 

92 

91 

90 

88 

87 

127 

.154 

108 

106 

105 

104 

103 

101 

100 

99 

98 

96 

95 

93 

92 

91 

89 

88 

128 

.2(58 

109 

107 

106 

'105 

104 

102 

101 

100 

90 

97 

96 

96 

93 

92 

90 

89 

129 

.385 

110 

108 

107 

106 

105 

104 

102 

101 

100 

98 

97 

96 

94 

93 

92 

90 

130 

4.504 

111 

110 

108 

107 

106 

105 

103 

102 

101 

100 

98 

97 

96 

94 

93 

91 

131 

.627 

112 

111 

109 

108 

107 

106 

105 

103 

102 

101 

99 

98 

97 

95 

94 

93 

132 

.  752 

113 

112 

110 

109 

108 

107 

106 

104 

103 

102 

100 

99 

98 

97 

95 

.   94 

133 

4.880 

114 

113 

112 

110 

109 

108 

107 

105 

104 

103 

102 

100 

99 

98 

96 

95 

134 

5.011 

115 

114 

113 

111 

110 

109 

108 

107 

105 

104 

103 

101 

100 

99 

98 

96 

135 

5.145 

116 

115 

114 

112 

111 

110 

109 

108 

106 

105 

104 

103 

101 

100 

99 

97 

136 

.282 

117 

116 

115 

114 

112 

111 

110 

109 

107 

106 

105 

104 

102 

101 

100 

98 

137 

.422 

118 

117 

116 

115 

113 

112 

111 

110 

109 

107 

106 

105 

104 

102 

101 

100 

138 

.565 

119 

118 

117 

116 

114 

113 

112 

111 

110 

108 

107 

106 

105 

103 

102 

101 

139 

.712 

120 

119 

118 

117 

110 

114 

113 

112 

111 

110 

108 

107 

106 

104 

103 

102 

140 

5.862 

121 

120 

119 

118 

117 

115 

114 

113 

112 

111 

109 

108 

107 

106 

104 

103 

40 


TABLE  III.  —  Temperature  of  dew-point  in  degrees  Fahrenheit. 


Pressure  =  27.  0  inches. 


Air 
temp. 
t 

Vapor 
press. 
e 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

33 

84 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

46 

47 

48 

81 

1.056 

—40 

~1 

82 

.091 

—16 

83 

.127 

—  6 

—32 

84 

.163 

+  2 

-13 

85 

1.201 

8 

—  3 

—26 

86 

.241 

12 

+  4 

—10 

87 

.281 

16 

9 

-  1 

—20 

88 

.322 

19 

14 

+  6 

—  7 

—48 

89 

.364 

23 

17 

11 

+  1 

-16 

90 

1.408 

25 

21 

15 

7 

—  * 

—32 

91 

.453 

28 

24 

19 

12 

+  3 

—12 

92 

.499 

30 

27 

22 

16 

9 

—  2 

—24 

93 

.546 

32 

29 

25 

20 

14 

+  5 

—  8 

94 

.595 

35 

31 

27 

23 

18 

11 

+  1 

—17 

95 

1.645 

37 

34 

30 

26 

21 

15 

8 

—  4 

—51 

96 

.696 

39 

36 

32 

28 

24 

19 

13 

+  4 

—12 

97 

.749 

42 

38 

35 

31 

27 

23 

17 

10 

—  1 

—24 

98 

.803 

44 

40 

37 

34 

30 

26 

21 

14 

-h  6 

—  7 

99 

.859 

46 

43 

39 

36 

32 

28 

24 

19 

12 

+  2 

—16 

100 

1.916 

47 

45 

42 

38 

35  1 

31 

27 

22 

16 

9 

—  4 

—34 

101 

1.975 

49 

46 

44 

41 

37 

34 

30 

25 

20 

14 

+  5 

—11 

102 

2.035 

51 

48 

46 

43 

40 

36 

32 

28 

24 

18 

11 

±  0 

—22 

103 

.097 

53 

50 

48 

45 

42 

38 

35 

31 

27 

22 

16 

+  7 

—  5 

—57 

104 

.160 

54 

52 

49 

47 

44 

41 

37 

34 

30 

25 

20 

13 

+  3 

—13 

105 

2.225 

56 

54 

51 

49 

46 

43 

40 

36 

32 

28 

23 

18 

10 

—  2 

—27 

106 

.292 

58 

55 

53 

60 

48 

45 

42 

38 

35 

31 

27 

21 

15 

+  7 

—  8 

107 

.360 

59 

57 

55 

52 

50 

47 

44 

41 

37 

34 

30 

25 

20 

12 

+  2 

—17 

108 

.431 

61 

59 

56 

54 

52 

49 

46 

43 

40 

36 

32 

28 

23 

17 

9 

—  3 

109 

.503 

62 

60 

58 

56 

53 

51 

48 

45 

42 

39 

35 

31 

27 

21 

15 

+  6 

110 

2.576 

64 

62 

60 

57 

55 

53 

50 

47 

44 

41 

38 

34 

30 

25 

19 

12 

111 

.652 

65 

63 

61 

59 

57 

54 

52 

49 

46 

43 

40 

36 

32 

28 

23 

17 

112 

.730 

67 

65 

63 

61 

58 

56 

54 

51 

49 

46 

43 

39 

35 

31 

27 

21 

113 

.810 

68 

66 

64 

62 

60 

58 

56 

53 

50 

48 

45 

42 

38 

34 

30 

25 

114 

.891 

69 

68 

66 

64 

62 

60 

57 

55 

52 

50 

47 

44 

40 

37 

33 

28 

115 

2.  975 

71 

69 

67 

65 

63 

61 

59 

57 

54 

52 

49 

46 

43 

39 

36 

31 

116 

3.061 

72 

70 

69 

67 

65 

63 

61 

58 

56 

54 

51 

48 

45 

42 

38 

34 

117 

.148 

74 

72 

70 

68 

66 

64 

62 

60 

58 

55 

53 

50 

47 

44 

41 

37 

118 

.239 

75 

73 

71 

70 

68 

66 

64 

62 

60 

57 

55 

52 

49 

46 

43 

40 

119 

.331 

76 

75 

73 

71 

69 

67 

G5 

63 

61 

59 

57 

54 

52 

49 

46 

42 

120 

3.425 

78 

76 

74 

72 

71 

69 

67 

65 

63 

61 

58 

56 

54 

51 

48 

45 

121 

.522 

79 

77 

76 

74 

72 

70 

68 

66 

64 

62 

60 

58 

55 

53 

50 

47 

122 

.621 

80 

78 

77 

75 

73 

72 

70 

68 

66 

04 

62 

60 

57 

55 

52 

49 

123 

.723 

81 

80 

78 

77 

75 

73 

71 

69 

68 

66 

63 

61 

59 

57 

54 

51 

124 

.827 

83 

81 

80 

78 

76 

74 

73 

71 

69 

67 

65 

63 

61 

58 

56 

53 

125 

3.933 

84 

82 

81 

79 

78 

76 

74 

72 

70 

69 

67 

65 

62 

60 

58 

55 

126 

4.042 

85 

84 

82 

80 

79 

77 

76 

74 

72 

70 

68 

66 

64 

62 

60 

57 

127 

.154 

86 

85 

83 

82 

80 

78 

77 

75 

73 

72 

70 

68 

66 

64 

61 

69 

128 

.268 

88 

86 

85 

83 

81 

80 

78 

76 

75 

73 

71 

69 

67 

65 

63 

61 

129 

.386 

89 

87 

86 

84 

83 

81 

80 

78 

76 

74 

73 

71 

69 

67 

65 

63 

130 

4.504 

90 

89 

87 

86 

84 

82 

81 

79 

78 

76 

74 

72 

70 

68 

66 

64 

131 

.627 

91 

90 

88 

87 

85 

84 

82 

81 

79 

77 

76 

74 

72 

70 

68 

66 

132 

.752 

92 

91 

90 

88 

87 

85 

84 

82 

80 

79 

77 

75 

73 

71 

69 

68 

133 

4.880 

94 

92 

91 

89 

88 

86 

85 

83 

82 

80 

78 

77 

75 

73 

71 

69 

134 

5.011 

95 

93 

92 

91 

89 

88 

86 

85 

83 

81 

80 

78 

76 

74 

73 

71 

135 

5.145 

96 

95 

93 

92 

90 

89 

87 

86 

84 

83 

81 

79 

78 

76 

74 

72 

136 

.282 

97 

96 

94 

93 

92 

90 

89 

87 

86 

84 

82 

81 

79 

77 

76 

74 

137 

.422 

98 

97 

96 

94 

93 

91 

90 

88 

87 

85 

84 

82 

80 

79 

77 

75 

138 

.565 

99 

98 

97 

95 

94 

92 

91 

90 

88 

87 

85 

83 

82 

80 

78 

77 

139 

.712 

101 

99 

98 

97 

95 

94 

92 

91 

89 

88 

86 

85 

83 

82 

80 

78 

140 

5.862 

102 

100 

99 

98 

96 

95 

94 

92 

91 

89 

88 

86 

84 

83 

81 

80 

DEW-POINT. 

41 

TABLE  IV. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  25.0  inches. 


Depression  of  wet-bnlb  thermometer  (t  —  t'). 

Air 

Vapor 

temp. 

press. 

t 

e 

.2 

.4 

.6 

.8 

1.2 

1. 

4 

1.6 

1.8 

2.0 

2.2 

2.4 

2.6 

2.8 

3.0 

—40 

.0039 

—49 

—39 

41 

—48 

(l—f) 

—  38 
—37 

44 
46 

—  47 

—46 

—60 

t 

e 

t 

' 

.1 

.2 

.3 

.4 

.5 

36 

48 

—  44 

—  58 

—60 

.0010 

52 

.0018 

—60 

—35 

.0051 

—42 

—55 

—59 

11 

51 

19 

—59 

—34 
—33 
—32 
—31 

54 
57 
61 
65 

—40 
—38 
—36 

—52 
—50 

—48 
—46 

—59 

—58 
—57 
—50 

—55 

12 
13 
13 

.0015 

50 

49 
48 
47 

.0021 
22 
24 
26 

—58 
—56 
—54 
—53 

1 

—  54  y 

16 

46 

27 

—51 

—30 
—29 

.0069 
74 
78 
83 
89 

—35 
—34 
—32 
—31 
—30 

—44 
—41 
—39 
—37 
—35 

—56 
—52 
—49 
—46 
-44 

—56 

-53* 

.0017 

45 
44 
43 
42 
41 

.0029 
31 
33 
35 
37 

—50 
—49 

—59 
—57 
—55 
—53 
—51 

—60 

1 

—28 
—27 
—26 

—47 
—46 
—45 

—25 
—24 
—23 
—22 
—21 

.0094 
.0100 
106 
112 
119 

—29 
—27 
—26 
—25 
—24 

—33 
—32 
—31 
—29 
—28 

—38 
—36 
—34 
—32 

—52 
—48 
—45 
—42 
—39 

—58 
—52 
—48 

40 
39 
38 
37 
36 

.0039 
41 
44 

46 

48 

—44 
—43 
—42 
—41 
—40 

—49 
—48 
—47 
—46 
—44 

—58 
—56 
—54 
-52 
—50 

—60 
—58 

35 

.0051 

-.39 

—42 

—48 

—55 

34 

54 

—37 

—41 

-46 

—52 

—20 
—19 

.  0126 
133 

—23 
—22 

—26 
—25 

—30 
—29 

—36 
—33 

—  44 
—40 

—60 
—53 

33 
32 

57 
61 

—35 

—40 
—38 

—45 
—43 

-50 
—  48 

—58 
—55 

—18 
—17 
—16 

141 
150 

159 

—20 
—19 
—18 

24 
—22 
—21 

27 
—26 
-24 

—31 
—29 
—28 

—37 
—35 
—32 

—48 
—43 
—39 

—56 
-49 

31 
30 

65 
.0069 

—33 
—32 

—36 
-35 

—41 

—39 

—46 
—  44 

—51 

—49 

—15 

.0168 

—17 

—.0 

—22 

—26 

—30 

—35 

—  4 

4 

—59 

—14 

178 

—16 

—18 

—21 

—24 

—28 

—32 

—40 

—50 

—13 

188 

—15 

—17 

—20 

—23 

—26 

—30 

—  ; 

J6 

—  45 

—60 

—12 

—14 

—16 

—18 

—21 

—  24 

—28 

—33 

—40 

—51 

—11 

210 

—13 

—15 

—17 

—19 

—22 

—26 

—30 

—36 

—45 

—60 

—10 

.0222 

—12 

—14 

—16 

—18 

-21 

—24 

—27 

—32 

—40 

—50 

—  9 

234 

—11 

—12 

—14 

—17 

—19 

—22 

-33 

—29 

—35 

—44 

—59 

—  8 

247 

—10 

—11 

—13 

—15 

—18 

—20 



r.', 

—27 

—32 

—38 

—49 

—  7 

260 

—  9 

—10 

—12 

—14 

—16 

—19 



11 

—25 

—29 

—33 

—42 

—55 

—  6 

275 

—  7 

—  9 

—11 

—13 

—15 

—17 

—19 

—22 

—26 

—30 

—36 

—46 

—  5 

.0291 

—  6 

g 

—10 

—11 

—13 

—15 

—18 

—20 

—24 

—27 

—32 

—40 

—50 

—  4 

307 

—  5 

—  7 

—  8 

—10 

—12 

—14 



u> 

—18 

—21 

—25 

—29 

—34 

—42 

—58 

—  3 

325 

—  4 

—  6 

—  7 

—  9 

—10 

—12 

—14 

—17 

—19 

—22 

—26 

—30 

—36 

—46 

—  2 

344 

—  3 

—  4 

—  6 

—  7 

—  9 

—11 

• 

13 

—15 

—17 

—20 

—23 

—26 

—31 

—38 

—  49 

—  1 

363 

—  2 

—  3 

—  5 

—  6 

—  7 

—  9 

—11 

—13 

—15 

—17 

—20 

—23 

—27 

—32 

—40 

0 

.0383 

_  i 

—  2 

—  3 

—  5 

—  G 

—  8 



9 

—11 

—13 

—15 

—18 

—21 

—24 

—28 

—33 

+  1 

403 

±  o 

—  1 

o 

—  4 

—  5 

—  6 



8 

—10 

—11 

—13 

—16 

—18 

—21 

—25 

—29 

2 

423 

-f  1 

±  o 

—  1 

—  2 

—  4 

—  5 

— 

0 

—  8 

—10 

—12 

—14 

-16 

—18 

—22 

—25 

3 

444 

2 

+  1 

4-  0 

—  1 

—  3 

—  4 



5 

—  7 

—  8 

—10 

—12 

—14 

—16 

—19 

—22 

4 

467 

3 

2 

4-  1 

±  0 

—  1 

—  3 

— 

4 

—  5 

—  8 

—  10 

—12 

—14 

—16 

—19 

5 

.0491 

4 

3 

2 

+  1 

±  o 

—  1 



3 

—  4 

—  5 

—  7 

—  8 

—10 

—12 

—14 

—17 

6 

515 

5 

4 

3 

2 

+  1 

±  0 



1 

—  3 

—  4 

—  5 

—  7 

—  8 

—10 

—12 

—14 

7 

542 

6 

5 

4 

3 

2 

+  1 

± 

0 

—  1 

—  3 

—  4 

—  5 

—  7 

—  8 

—10 

—12 

8 

570 

7 

6 

5 

4 

3 

2 

-r 

1 

±  0 

—  1 

—  3 

—  4 

—  5 

—  7 

—  8 

—10 

9 

600 

8 

7 

6 

6 

5 

4 

2 

•f  1 

±  o 

—  1 

—  2 

—  4 

—  5 

-  6 

—  8 

10 

.0631 

9 

8 

8 

7 

6 

5 

4 

3 

+  2 

±  0 

—  1 

—  2 

—  3 

—  5 

—  6 

11 

665 

10 

10 

9 

8 

7 

6 

5 

4 

3 

+  2 

+  1 

T 

—  2 

—  3 

—  4 

12 

699 

11 

11 

10 

9 

8 

7 

G 

5 

4 

3 

2 

+  1 

±  0 

—  2 

—  3 

13 

735 

12 

12 

11 

10 

9 

8 

8 

7 

6 

5 

4 

2 

+  1 

±  0 

—  1 

14 

772 

13 

13 

12 

11 

10 

10 

9 

8 

7 

6 

5 

4 

3 

+  2 

+  1 

15 

.0810 

14 

14 

13 

12 

11 

11 

10 

9 

8 

1 

7 

6 

4 

3 

2 

16 

850 

15 

15 

14 

13 

13 

12 

11 

10 

10 

9 

8 

7 

6 

5 

4 

17 

891 

16 

16 

15 

14 

14 

13 

12 

11 

11 

10 

9 

8 

7 

6 

5 

18 

933 

17 

17 

16 

15 

15 

14 

13 

13 

12 

11 

10 

10 

9 

8 

7 

19 

.Ou79 

18 

18 

17 

16 

16 

15 

14 

14 

13 

12 

12 

11 

10 

9 

8 

20 

.1026 

19 

19 

18 

18 

17 

16 

16 

15 

14 

13 

13 

12 

11 

10 

1(1 

TABLE  IV. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  25.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

ieinp. 

t 

3.2 

3.4 

3.6 

3.8 

4.0 

4.2 

4.4 

4.6 

4.8 

5.0 

5.2 

5.4 

5.6 

5.8 

6.0 

-  1 

-53 

0 

-42 

-57 

+  1 

-34 

-44 

2 

-29 

-35 

—46 

3 

-25 

-30 

-36 

-47 

4 

-22 

-26 

—30 

-37 

-49 

5 

-19 

-22 

-26 

-31 

-38 

-50 

6 

-17 

-20 

-23 

-27 

-32 

-39 

-51 

7 

-14 

-17 

-20 

-23 

-27 

-32 

-40 

-53 

8 

-12 

—14 

-17 

-19 

-23 

-27 

-32 

-40 

-53 

9 

-10 

-12 

-14 

-17 

-19 

-23 

-27 

-32 

-40 

—54 

10 

-  8 

-10 

-12 

-14 

-16 

-19 

-23 

-27 

-32 

-40 

-53 

11 

-  6 

—  8 

-10 

—12 

—14 

—  16 

-19 

-22 

-26 

-31 

-39 

-52 

12 

-  4 

-  6 

-  7 

-  9 

-11 

-13 

-16 

-18 

-22 

-26 

-30 

-38 

—50 

13 

-  2 

-  4 

-  5 

-  7 

—  9 

—11 

-13 

-15 

-18 

-21 

-25 

-30 

-37 

-48 

14 

—  1 

-  2 

-  3 

-  5 

-  6 

-  8 

-10 

-12 

-15 

-17 

-20 

-24 

-29 

-35 

-45 

15 

+  1 

±  o 

i 

-  3 

-  4 

1-  6 

-  8 

-10 

-12 

-14 

-16 

-19 

-23 

-27 

-33 

16 

3 

+  1 

±  o 

-  1 

—  2 

—  4 

—  5 

_  Y 

Q 

-11 

-13 

-16 

-18 

-22 

-26 

17 

4 

3 

+  2 

+  1 

-  1 

0 

—  3 

-  5 

-  6 

-  8 

-10 

-12 

-15 

-17 

-20 

18 

6 

5 

4 

3 

+  1 

±  0 

—  1 

,  O 

_  4 

-  6 

-  7 

-  9 

-11 

-14 

-16 

19 

7 

6 

5 

4 

3 

-f  2 

+  1 

-  1 

-  2 

—  3 

-  5 

-  7 

—   8 

-10 

-13 

20 

9 

8 

7 

6 

5 

4 

3 

+  1 

±  0 

-  1 

—  3 

-  4 

—  6 

—  8 

-10 

(<-'). 

f 

6.2        6.4        6.6        6.8        7.0         7.2        7.4        7.6 

15      —43 

16      —31      —40     —56 

17      —25     —29     —36     —49 

18      —19     —23     —27     —33      —44 

19      —15     —18     —21     —26     —31      —40     —55 

20      —12     —14     —17     —20     —34      —29     —36     —47 

DEW-POINT. 

43 

TABLE  IV. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  25.0  inches. 


Air 

Vapor 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

temp. 

t. 

press. 
e. 

0.5 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

4.  0 

4.5 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

20 

0.103 

1!) 

17 

15 

13 

12 

10 

7 

r) 

2 

—  1 

—  5 

—10 

—15 

—24 

—42 

21 

.108 

20 

18 

16 

15 

13 

11 

9 

6 

4 

+  1 

—  3 

—  7 

—12 

—18 

—29 

—60 

22 

.113 

21 

19 

18 

16 

14 

12 

10 

8 

r> 

3 

—  1 

—  4 

—  9 

—14 

—22 

—36 

23 

.118 

2'2 

20 

19 

17 

15 

13 

12 

10 

7 

5 

+  1 

—  2 

—  6 

—11 

—17 

—27 

24 

.124 

23 

21 

20 

18 

17 

15 

13 

11 

9 

6 

3 

±  0 

—  3 

—7 

—13 

—20 

25 

0.  130 

24 

22 

21 

20 

18 

16 

14 

12 

10 

8 

5 

+  2 

1 

—5 

—  9 

—15 

26 

.136 

25 

23 

22 

21 

19 

18 

16 

14 

12 

10 

7 

5 

-fl 

—2 

—  6 

—11 

27 

.143 

26 

25 

23 

22 

20 

19 

17 

15 

13 

11 

9 

7 

4 

±0 

—  4 

—  8 

28 

.150 

27 

26 

24 

23 

22 

20 

18 

17 

15 

13 

11 

8 

6 

+3 

—  1 

—  5 

29 

.157 

28 

27 

25 

24 

23 

21 

20 

18 

16 

14 

12 

10 

8 

5 

+  2 

—  2 

30 

0.164 

29 

28 

26 

25 

24 

22 

21 

19 

18 

16 

14 

12 

10 

7 

4 

+  1 

31 

.172 

30 

29 

28 

26 

25 

24 

22 

21 

19 

17 

16 

14 

11 

9 

7 

3 

32 

.180 

31 

30 

29 

27 

26 

25 

23 

22 

20 

19 

17 

15 

13 

11 

9 

6 

33 

.187 

32 

31 

30 

29 

27 

26 

25 

23 

22 

20 

19 

17 

15 

13 

11 

8 

34 

.195 

33 

32 

31 

30 

28 

27 

26 

25 

23 

22 

20 

18 

16 

14 

12 

10 

35 

0.203 

34 

33 

32 

31 

30 

28 

27 

26 

24 

23 

21 

20 

18 

16 

14 

12 

36 

.211 

35 

34 

33 

32 

31 

29 

28 

27 

26 

24 

23 

21 

20 

18 

16 

14 

37 

.219 

36 

35 

34 

33 

32 

31 

29 

28 

27 

26 

24 

•2:>> 

21 

19 

18 

16 

38 

.228 

37 

36 

35 

34 

33 

32 

30 

29 

28 

27 

2:> 

24 

23 

21 

19 

17 

39 

.237 

38 

37 

36 

35 

34 

33 

31 

30 

29 

28 

27 

25 

24 

22 

2L 

19 

40 

0.247 

39 

38 

37 

36 

35 

34 

32 

31 

30 

29 

28 

27 

25 

24 

22 

21 

41 

.256 

40 

39 

38 

37 

36 

35 

34 

32 

31 

30 

29 

28 

26 

25 

24 

22 

42 

.266 

41 

40 

39 

38 

37 

36 

35 

34 

32 

31 

30 

29 

28 

26 

25 

24 

43 

.277 

42 

41 

40 

39 

38 

37 

36 

35 

34 

32 

31 

30 

29 

28 

26 

25 

44 

.287 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

32 

31 

30 

29 

27 

26 

45 

0.298 

44 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

32 

31 

30 

29 

27 

46 

.310 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

32 

31 

30 

29 

47 

.  322 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

32 

31 

30 

48 

.334 

47 

46 

4o 

44 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

32 

31 

49 

.347 

48 

47 

46 

45 

44 

44 

43 

42 

40 

39 

38 

37 

36 

35 

34 

32 

50 

0.360 

49 

48 

47 

47 

46 

45 

44 

,43 

42 

41 

40 

38 

37 

36 

35 

34 

51 

.373 

50 

49 

48 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

35 

52 

.387 

51 

50 

49 

49 

48 

47  . 

46 

45 

44 

43 

42 

41 

40 

39 

38 

36 

53 

.402 

52 

51 

50 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

54 

.417 

53 

52 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

55 

0.432 

54 

53 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

56 

.448 

55 

54 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

57 

.465 

56 

55 

55 

54 

53 

52 

51 

50 

49 

48 

48 

47 

46 

45 

44 

43 

58 

.482 

57 

56 

5() 

55 

54 

53 

52 

51 

50 

50 

49 

48 

47 

46 

45 

44 

59 

.499 

58 

57 

57 

56 

55 

54 

53 

52 

52 

51 

50 

49 

48 

47 

46 

45 

60 

0.517 

59 

59 

58 

57 

56 

55 

54 

54 

53 

52 

51 

50 

49 

48 

47 

46 

61 

.536 

60 

60 

59 

58 

57 

56 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

62 

.555 

61 

61 

60 

59 

58 

57 

57 

56 

55 

54 

53 

52 

51 

50 

50 

49 

65, 

.575 

62 

62 

61 

60 

59 

58 

58 

57 

56 

55 

54 

54 

53 

52 

51 

50 

64 

.595 

63 

63 

62 

61 

60 

60 

59 

58 

57 

56 

55 

55 

54 

53 

52 

51 

65 

0.616 

64 

64 

63 

62 

61 

61 

60 

59 

58 

57 

56 

56 

55 

54 

53 

52 

66 

.638 

65 

65 

64 

63 

62 

62 

61 

60 

59 

58 

58 

57 

56 

55 

54 

53 

67 

.661 

66 

66 

65 

64 

63 

63 

62 

61 

60 

60 

59 

58 

67 

56 

55 

54 

68 

.684 

67 

67 

66 

65 

64 

64 

63 

62 

61 

61 

60 

59 

58 

57 

56 

56 

69 

.707 

68 

68 

67 

66 

65 

65 

64 

63 

62 

62 

61 

60 

59 

58 

58 

57 

70 

0.732 

69 

69 

68 

67 

66 

66 

65 

64 

63 

63 

62 

61 

60 

60 

59 

58 

71 

.757 

70 

70 

69 

68 

68 

67 

66 

65 

64 

64 

63 

62 

62 

61 

60 

59 

72 

.783 

71 

71 

70 

69 

69 

68 

67 

66 

66 

65 

64 

63 

63 

62 

61 

60 

73 

.810 

72 

72 

71 

70 

70 

69 

68 

67 

67 

66 

65 

64 

64 

63 

62 

61 

74 

.838 

73 

73 

72 

71 

71 

70 

69 

68 

68 

67 

66 

66 

65 

64 

63 

62 

75 

0.866 

74 

74 

73 

72 

72 

71 

70 

70 

69 

68 

67 

67 

66 

65 

64 

64 

76 

.896 

75 

75 

74 

73 

73 

72 

71 

71 

70 

69 

68 

68 

67 

66 

65 

65 

77 

.926 

76 

76 

75 

74 

74 

73 

72 

72 

71 

70 

69 

69 

68 

67 

66 

66 

78 

.957 

77 

77 

76 

75 

75 

74 

73 

73 

72 

71 

71 

70 

69 

68 

68 

67 

79 

.989 

78 

78 

77 

76 

76 

75 

74 

74 

,  73 

72 

72 

71 

70 

69 

69 

68 

80 

ii.ii 

1.022 

79 

79 

78 

77 

77 

76 

75 

75 

74 

73 

73 

72 

71 

70 

70 

69 

DEW-POINT. 

44 

TABLE  IV.  — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  25.0  inches. 


Air 

Vapor 

Depression  of  wet-bulb  thermometer  (1  —  f). 

temp. 

t 

press. 
e 

8.5 

9.0 

9.5 

10.0 

10.5 

11.0 

11.5 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

15.0 

15.5 

16.0 

23 

0.118 

-51 

24 

.124 

—32 

25 

0.130 

-24 

-43 

26 

.136 

—18 

—29 

27 

.143 

—13 

-22 

—36 

28 

.150 

-  9 

-16 

-25 

-48 

29 

.157 

—  6 

—11 

-18 

-30 

30 

0.164 

—  3 

—  7 

-13 

—22 

-37 

31 

.17J 

±  0 

—  4 

-  9 

-15 

—25 

-48 

32 

.180 

+  3 

—  1 

-  5 

—10 

—17 

—29 

33 

.187 

5 

+  2 

—  2 

—  6 

—12 

—20 

—34 

34 

.195 

8 

5 

+  1 

—  3 

7 

—14 

—22 

-42 

35 

0.203 

10 

7 

4 

±  o 

—  4 

—  9 

-15 

—26 

—52 

36 

.211 

12 

9 

6 

+  3 

±  o 

-  5 

—10 

—17 

—29 

37 

.219 

14 

11 

9 

6 

+  3 

—  1 

—  6 

—11 

—19 

—34 

38 

.228 

15 

13 

11 

8 

6 

+  2 

—  2 

—  6 

—13 

—22 

—40 

39 

.237 

17 

15 

13 

11 

8 

5 

+  1 

—  3 

—  7 

—14 

—24 

—48 

40 

0.247 

19 

17 

15 

13 

10 

8 

5 

+  1 

-  3 

O 

—16 

—27 

41 

.256 

21 

19 

17 

15 

13 

10 

7 

4 

±  0 

—  4 

—10 

—17 

-30 

42 

.266 

22 

20 

19 

17 

15 

12 

10 

7 

-h  * 

.-t  0 

-  5 

—11 

—18 

—33 

43 

.277 

23 

22 

20 

18 

17 

14 

12 

10 

7 

+  3 

—  1 

—  5 

—12 

—20 

—37 

44 

.287 

25 

23 

22 

20 

18 

16 

14 

12 

9 

6 

f  3 

—  1 

—  6 

—12 

—22 

—43 

45 

0.298 

26 

25 

23 

22 

20 

18 

16 

14 

12 

9 

6 

+  3 

-  2 

—  7 

—13 

—23 

46 

.310 

27 

26 

24 

23 

21 

20 

18 

16 

14 

11 

9 

6 

+  2 

—  2 

7 

—14 

47 

.322 

29 

27 

26 

24 

23 

21 

20 

18 

16 

14 

11 

9 

6 

+  2 

—  2 

-  8 

48 

.334 

30 

29 

27 

26 

24 

23 

21 

19 

18 

16 

13 

11 

8 

5 

+  1 

—  3 

49 

.347 

31 

30 

29 

27 

26 

24 

23 

21 

19 

18 

15 

13 

11 

8 

5 

+  1 

50 

0.  360 

32 

31 

30 

29 

27 

26 

24 

23 

21 

19 

17 

15 

13 

11 

8 

5 

51 

.373 

34 

32 

31 

30 

29 

27 

26 

24 

23 

21 

19 

17 

15 

13 

10 

8 

52 

.387 

35 

34 

32 

31 

30 

29 

27 

26 

24 

23 

21 

19 

17 

15 

13 

10 

53 

.402 

36 

35 

34 

32 

31 

30 

29 

27 

26 

24 

23 

21 

19 

17 

15 

13 

54 

.417 

38 

36 

35 

34 

33 

31 

30 

29 

27 

26 

24 

23 

21 

19 

17 

15 

55 

0.432 

39 

38 

37 

35 

34 

33 

31 

30 

29 

27 

26 

24 

23 

21 

19 

17 

56 

.448 

40 

39 

38 

37 

35 

34 

33 

32 

30 

29 

27 

26 

24 

23 

21 

19 

57 

.465 

42 

40 

39 

38 

37 

36 

34 

33 

32 

30 

29 

28 

26 

25 

23 

21 

58 

.482 

43 

42 

41 

39 

38 

37 

36 

34 

33 

32 

31 

29 

28 

26 

25 

23 

69 

.499 

44 

43 

42 

41 

40 

38 

37 

36 

35 

33 

32 

31 

29 

28 

26 

25 

60 

0.517 

45 

44 

43 

42 

41 

40 

38 

37 

36 

35 

34 

32 

31 

29 

28 

27 

61 

.536 

46 

45 

44 

43 

42 

41 

40 

39 

38 

36 

35 

34 

32 

31 

30 

28 

62 

.555 

48 

47 

46 

45 

44 

42 

41 

40 

39 

38 

36 

35 

34 

32 

31 

30 

63 

.  575 

49 

48 

47 

46 

45 

44 

43 

42 

40 

39 

38 

37 

35 

34 

33 

31 

64 

.595 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

34 

33 

65 

0.616 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

34 

66 

.638 

52 

52 

51 

50 

49 

48 

47 

46 

44 

43 

42 

41 

40 

39 

37 

36 

67 

.661 

54. 

53 

52 

51 

60 

49 

48 

47 

46 

45 

44 

43 

41 

40 

39 

38 

68 

.684 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

40 

39 

69 

.707 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

70 

0.732 

57 

56 

55 

54 

54 

53 

52 

51 

50 

49 

48 

47 

46 

44 

43 

42 

71 

.757 

58 

57 

56 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

72 

.783 

59 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

73 

.810 

61 

60 

59 

58 

57 

56 

55 

54 

54 

53 

52 

51 

50 

49 

48 

46 

74 

.838 

62 

61 

60 

59 

58 

57 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

75 

0.866 

63 

62 

61 

60 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

76 

.896 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

55 

54 

54 

53 

52 

51 

77 

.926 

65 

64 

63 

63 

62 

61 

60 

59 

58 

58 

57 

56 

55 

54 

53 

52 

78 

.9o7 

66 

65 

64 

64 

63 

62 

61 

60 

60 

59 

58 

57 

56 

55 

54 

53 

79 

0.989 

67 

66 

66 

65 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

56 

§5 

80 

1.022 

68 

68 

67 

66 

65 

64 

64 

63 

62 

61 

60 

59 

59 

58 

57 

56 

DEW-POINT. 

45 

TABLE  IV. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  25.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t  —  f). 

L-6mp. 

t 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

20.0 

20.5 

21.0 

21.5 

22.0 

22.5 

23.0 

23.5 

24.0 

45 

—50 

46 

—25 

—58 

47 

—15 

—27 

48 

—  8 

—16 

—29 

49 

0 

—  9 

—17 

—30 

50 

+  1 

—  4 

—  9 

—17 

-32 

51 

4 

±  0 

—  4 

—10 

—18 

—34 

52 

7 

+  4 

±  0 

—  5 

—  11 

—20 

—37 

53 

10 

7 

+  4 

±  0 

—  5 

—12 

—21 

—42 

54 

12 

10 

7 

+  3 

—  1 

—  6 

—12 

—22 

—46 

55 

15 

12 

10 

7 

+  3 

—  1 

—  6 

—13 

—23 

—50 

56 

17 

15 

12 

10 

7 

+  3 

—  1 

—  6 

—14 

—24 

—57 

57 

19 

17 

15 

12 

10 

7 

+  3 

—  2 

IT 

—14 

—25 

58 

21 

19 

17 

15 

12 

10 

6 

+  3 

—  2 

—  7 

—15 

—27 

59 

23 

21 

19 

17 

15 

12 

10 

7 

+  3 

—  2 

—  7 

—15 

—28 

60 

25 

23 

21 

19 

17 

15 

12 

10 

7 

+  3 

—  2 

-  7 

—15 

—29 

61 

27 

25 

23 

21 

19 

17 

15 

13 

10 

7 

+  3 

—  2 

—  8 

—16 

—29 

62 

28 

27 

25 

23 

22 

20 

17 

15 

13 

10 

7 

+  3 

—  2 

—  8 

—16 

—29 

63 

30 

28 

27 

25 

24 

22 

20 

18 

15 

13 

10 

7 

+  3 

—  2 

—  8 

—16 

64 

32 

30 

29 

27 

25 

24 

22 

20 

18 

16 

13 

10 

7 

+  3 

—  2 

—  8 

65 

33 

32 

30 

29 

27 

26 

24 

22 

20 

18 

16 

13 

10 

7 

+  3 

—  2 

66 

35 

33 

32 

30 

29 

27 

26 

24 

22 

20 

18 

16 

13 

10 

7 

+  3 

67 

36 

35 

33 

32 

31 

29 

28 

26 

24 

23 

21 

18 

16 

13 

10 

7 

68 

38 

37 

35 

34 

32 

31 

29 

28 

26 

24 

23 

21 

19 

16 

14 

11 

69 

39 

38 

37 

35 

34 

32 

31 

30 

28 

26 

25 

23 

21 

19 

16 

14 

70 

41 

40 

38 

37 

36 

34 

33 

31 

30 

28 

27 

25 

23 

21 

19 

17 

71 

42 

41 

40 

39 

37 

36 

34 

33 

32 

30 

29 

27 

25 

23 

22 

19 

72 

44 

43 

42 

40 

?9 

38 

36 

35 

33 

32 

30 

29 

27 

26 

24 

22 

73 

45 

44 

43 

42 

41 

39 

38 

37 

35 

34 

32 

31 

29 

28 

26 

24 

74 

47 

46 

44 

43 

42 

41 

40 

38 

37 

36 

34 

32 

31 

29 

28 

26 

75 

48 

47 

46 

45 

44 

42 

41 

40 

38 

37 

36 

34 

33 

31 

30 

28 

76 

50 

49 

47 

46 

45 

44 

43 

42 

40 

39 

38 

.  36 

35 

33 

32 

30 

77 

51 

50 

49 

48 

47 

46 

44 

43 

42 

41 

39 

38 

36 

35 

34 

32 

78 

52 

51 

50 

49 

48 

47 

46 

45 

44 

42 

41 

40 

38 

37 

35 

34 

79 

54 

53 

52 

51 

50 

48 

47 

46 

45 

44 

43 

41 

40 

39 

37 

36 

80 

55 

54 

53 

52 

51 

50 

49 

48 

46 

45 

44 

43 

42 

40 

39 

38 

t 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

24.5 

25.0 

25.5 

26.0 

26.5 

27.0 

27.5 

28.0 

28.5 

29.0 

29.5 

30.0 

30.5 

31.0 

31.5 

32.0 

63 

—30 

64 

—16 

—30 

65 

—  8 

—16 

—30 

66 

2 

—  7 

—16 

—30 

67 

+  3 

—  2 

y 

—15 

—30 

68 

7 

+  4 

—  1 

—  7 

—15 

—30 

69 

11 

8 

+  4 

—  1 

—  7 

—15 

—29 

70 

14 

11 

8 

+  4 

—  1 

—  6 

—14 

—28 

71 

17 

14 

12 

8 

+  4 

±  o 

—  6 

—14 

—28 

72 

19 

17 

15 

12 

9 

+  5 

±  0 

—  5 

—14 

—26 

73 

2-2 

20 

18 

15 

12 

9 

+  5 

+  1 

—  5 

—13 

—25 

74 

24 

22 

20 

18 

15 

12 

9 

6 

+  1 

—  4 

—12 

—24 

75 

26 

25 

23 

21 

18 

16 

13 

10 

6 

+  2 

—  4 

—11 

—23 

76 

28 

27 

25 

23 

21 

19 

16 

13 

10 

7 

+  2 

—  3 

-10 

-21 

—54 

77 

30 

29 

27 

25 

23 

21 

19 

16 

14 

11 

7 

+  3 

—  3 

—  9 

—20 

—48 

78 

32 

31 

29 

27 

26 

24 

22 

19 

17 

14 

11 

8 

+  3 

—  2 

—  y 

—19 

79 

34 

32 

31 

29 

28 

26 

24 

22 

20 

17 

15 

12 

8 

+  4 

—  1 

—  8 

80 

36 

34 

33 

31 

30 

28 

26 

24 

22 

20 

18 

15 

12 

9 

-t-  5 

db  0 

DEW-POINT. 

46 

TABLE  IV  — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure=25.0  inches. 


Air 
temp. 
/ 

Vapor 

sress. 
e 

Depression  of  wet-bulb  thermometer  (t—  f). 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

80 

1.022 

79 

77 

76 

76 

73 

72 

70 

69 

68 

66 

64 

63 

61 

69 

58 

56 

81 

.056 

80 

78 

77 

76 

74 

73 

72 

70 

69 

67 

66 

64 

62 

61 

59 

57 

82 

.091 

81 

79 

78 

77 

75 

74 

73 

71 

70 

68 

67 

65 

64 

62 

60 

58 

83 

.127 

82 

80 

79 

78 

76 

75 

74 

72 

71 

69 

68 

66 

65 

63 

61 

60 

84 

.163 

83 

81 

80 

79 

78 

76 

75 

73 

72 

70 

69 

67 

66 

64 

63 

61 

85 

1.201 

84 

82 

81 

30  !  79 

77 

76 

74 

73 

72 

70 

69 

67 

65 

64 

62 

86 

.241 

85 

83 

82 

81  i  80 

78 

77 

76 

74 

73 

71 

70 

68 

67 

65 

63 

87 

.281 

86 

84 

83 

82 

81 

79 

78 

77 

75 

74 

72 

71 

69 

68 

66 

65 

88 

.322 

87 

86 

84 

83 

82 

80 

79 

78 

76 

75 

73 

72 

70 

69 

67 

66 

89 

.364 

88 

87 

85 

84 

83 

81 

80 

79 

77 

76 

75 

73 

72 

70 

69 

67 

90 

1.408 

89 

88 

86 

85 

84 

82 

81 

80 

78 

77 

76 

74 

73 

71 

70 

68 

91 

.453 

90 

89 

87 

86 

85 

83 

82 

81 

80 

78 

77 

75 

74 

72 

71 

69 

92 

.499 

91 

90 

88 

87 

86 

85 

83 

82 

81 

79 

78 

76 

75 

74 

72 

71 

93 

.546 

92 

91 

89 

88 

87 

86 

84 

83 

82 

80 

79 

78 

76 

75 

73 

72 

94 

.595 

93 

92 

90 

89 

88 

87 

85 

84 

83 

81 

80 

79 

77 

76 

74 

73 

95 

1.645. 

94 

93 

91 

90 

89 

88 

86 

85 

84 

82 

81 

80 

78 

77 

75 

74 

96 

.696 

95 

94 

92 

91 

90 

89 

87 

86 

85 

84 

82 

81 

79 

78 

77 

75 

97 

.749 

96 

95 

93 

92 

91 

90 

88 

87 

86 

85 

83 

82 

81 

79 

78 

76 

98 

.803 

97 

96 

94 

93 

92 

91 

90 

88 

87 

86 

84 

83 

82 

80 

79 

77 

99 

.859 

98 

97 

95 

94 

93 

92 

91 

89 

88 

87 

85 

84 

83 

81 

80 

78 

100 

1.916 

99 

98 

96 

95 

94 

93 

92 

90 

89 

88 

86 

85 

84 

82 

81 

80 

101 

1.975 

100 

99 

97 

96 

95 

94 

93 

91 

90 

89 

88 

86 

85 

84 

82 

81 

102 

2.035 

101 

100 

98 

97 

96 

95 

94 

92 

91 

90 

89 

87 

86 

85 

83 

82 

103 

.097 

102 

101 

100 

98 

97 

96 

95 

93 

92 

91 

90 

88 

87 

86 

84 

83 

104 

.160 

103 

102 

101 

99 

98 

97 

96 

94 

93 

92 

91 

89 

88 

87 

86 

84 

105 

2.225 

104 

103 

102 

100 

99 

98 

97 

96 

94 

93 

92 

91 

89 

88 

87 

85 

106 

.292 

105 

104 

103 

101 

100 

99 

98 

97 

95 

94 

93 

92 

90 

89 

88 

86 

107 

.360 

106 

105 

104 

102 

101 

100 

99 

98 

96 

95 

94 

93 

91 

90 

89 

88 

108 

.431 

107 

106 

105 

103 

102 

101 

100 

99 

97 

96 

95 

94 

92 

91 

90 

89 

109 

.503 

108 

107 

106 

104 

103 

102 

101 

100 

98 

97 

96 

95 

94 

92 

91 

90 

110 

2.576 

109 

108 

107 

105 

104 

103 

102 

101 

100 

98 

97 

96 

95 

93 

92 

91 

111 

.652 

110 

109. 

108 

106 

105 

104 

103 

102 

101 

99 

98 

97 

96 

94 

93 

92 

112 

.730 

111 

110 

109 

107 

106 

105 

104 

103 

102 

100 

99 

98 

97 

95 

94 

93 

113 

.810 

112 

111 

110 

108 

107 

106 

105 

104 

103 

101 

100 

99 

98 

97 

95 

94 

114 

.891 

113 

112 

111 

109 

108 

107 

106 

105 

104 

102 

101 

100 

99 

98 

90 

95 

115 

2.975 

114 

113 

112 

110 

Iu9 

108 

107 

106 

105 

.104 

102 

101 

100 

99 

97 

96 

116 

3.061 

115 

114 

113 

112 

110 

109 

108 

107 

106 

105 

103 

102 

101 

100 

99 

97 

117 

.148 

116 

115 

114 

113 

111 

110 

109 

108 

107 

106 

104 

103 

102 

101 

100 

!>8 

118 

.239 

117 

116 

115 

114 

112 

111 

110 

109 

108 

107 

105 

104 

103 

102 

101 

99 

119 

.331 

118 

117 

116 

115 

113 

112 

111 

110 

109 

108 

106 

105 

104 

103 

102 

100 

120 

3.425 

119 

118 

117 

116 

114 

113 

112 

111 

110 

109 

108 

106 

105 

104 

103 

102 

121 

.522 

120 

119 

118 

117 

115 

114 

113 

112 

111 

110 

109 

107 

106 

105 

104 

103 

122 

.621 

121 

120 

119 

118 

116 

115 

114 

113 

112 

111 

110 

108 

107 

106 

105 

104 

123 

.723 

122 

121 

120 

119 

117 

116 

115 

114 

113 

112 

111 

109 

108 

107 

106 

105 

124 

.827 

123 

122 

121 

120 

118 

117 

116 

115 

114 

113 

112 

110 

109 

108 

107 

106 

125 

3.933 

124 

123 

122 

121 

119 

118 

117 

116 

115 

114 

113 

112 

110 

109 

108 

107 

126 

4.042 

125 

124 

123 

122 

120 

119 

118 

117 

116 

115 

114 

113 

111 

110 

109 

108 

127 

.154 

126 

125 

124 

123 

122 

120 

119 

118 

117 

116 

115 

114 

112 

111 

110 

109 

128 

.268 

127 

126 

125 

124 

123 

121 

120 

119 

118 

117 

116 

115 

113 

112 

111 

110 

129 

.385 

128 

127 

126 

125 

124 

122 

121 

120 

119 

118 

117 

116 

115 

113 

112 

111 

130 

4.504 

129 

128 

127 

126 

125 

123 

122 

121 

120 

119 

118 

117 

116 

114 

113 

112 

131 

.627 

130 

129 

128 

127 

126 

124 

123 

122 

121 

120 

119 

118 

117 

115 

114 

113 

132 

.752 

131 

130 

129 

128 

127 

125 

124 

123 

122 

121 

1-20 

119 

118 

116 

115 

114 

133 

4.880 

132 

131 

130 

129 

128 

126 

125 

124 

123 

122 

121 

120 

119 

118 

116 

115 

134 

5.011 

133 

132 

131 

130 

129 

127 

126 

125 

124 

123 

122 

121 

120 

119 

117 

116 

135 

5.145 

134 

133 

132 

131 

130 

129 

127 

126 

125 

124 

123 

122 

121 

120 

118 

117 

136 

.282 

135 

134 

133 

132 

131 

130 

1-28 

127 

126 

125 

124 

123 

122 

121 

119 

118 

137 

.422 

136 

135 

134 

133 

132 

131 

129 

128 

127 

126 

125 

124 

123 

122 

121 

119 

138 

.565 

137 

136 

135 

134 

133 

132 

130 

129 

128 

127 

126 

125 

124 

123 

122 

120 

139 

.712 

138 

137 

136 

135 

134 

133 

131 

130 

129 

128 

127 

126 

125 

124 

123 

121 

140 

5.862 

139 

138 

137 

136 

135 

134 

132 

131 

130 

129 

128 

127 

126 

125 

124 

123 

DEW-POINT. 

47 

TABLE  IV. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  25.0  inches. 


Air 

Vapor 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

t 

e 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

80 

1.022 

54 

52 

50 

48 

45 

43 

40 

38 

34 

31 

28 

24 

20 

15 

9 

±  0 

81 

.056 

55 

53 

51 

49 

47 

45 

42 

39 

36 

33 

30 

27 

23 

18 

13 

+  5 

82 

.091 

57 

55 

53 

51 

48 

46 

44 

41 

38 

35 

32 

29 

25 

21 

16 

10 

83 

.127 

58 

56 

54 

52 

50 

48 

45 

43 

40 

37 

34 

31 

28 

24 

19 

14 

84 

.163 

59 

57 

55 

53 

51 

49 

47 

44 

42 

39 

36 

33 

30 

26 

22 

17 

85 

1.201 

60 

59 

57 

55 

53 

51 

48 

46 

44 

41 

38 

35 

32 

28 

25 

20 

86 

.241 

62 

60 

58 

56 

54 

52 

50 

48 

45 

43 

40 

37 

34 

31 

27 

23 

87 

.281 

63 

61 

59 

68 

56 

54 

52 

49 

47 

45 

42 

39 

36 

33 

29 

26 

88 

.322 

64 

62 

61 

59 

57 

55 

53 

51 

49 

46 

44 

41 

38 

35 

32 

28 

89 

.364 

65 

64 

62 

60 

58 

56 

54 

52 

50 

48 

45 

43 

40 

37 

34 

30 

90 

1.408 

67 

65 

63 

61 

60 

58 

56 

54 

52 

49 

47 

44 

42 

39 

36 

32 

91 

.453 

68 

66 

64 

63 

61 

59 

57 

55 

53 

51 

49 

46 

44 

41 

38 

35 

92 

.499 

69 

67 

66 

64 

62 

60 

59 

57 

55 

53 

50 

48 

45 

43 

40 

37 

93 

.  546 

70 

6'J 

67 

65 

64 

62 

60 

58 

56 

54 

52 

50 

47 

45 

42 

39 

94 

.595 

71 

70 

68 

07 

65 

63 

61 

59 

57 

55 

53 

51 

49 

46 

44 

41 

95 

1.645 

72 

71 

69 

68 

66 

64 

63 

61 

59 

57 

55 

53 

50 

48 

46 

43 

96 

.696 

74 

72 

71 

69 

67 

66 

64 

62 

60 

58 

56 

54 

52 

50 

47 

45 

97 

.74'J 

75 

73 

72 

70 

69 

67 

65 

63 

62 

60 

58 

5ii 

54 

51 

49 

46 

98 

.803 

76 

74 

73 

71 

70 

68 

66 

65 

63 

61 

59 

57 

55 

53 

51 

48 

99 

.859 

77 

76 

74 

73 

71 

69 

68 

66 

64 

62 

61 

59 

57 

55 

52 

50 

100 

1.916 

78 

77 

75 

74 

72 

71 

69 

67 

66 

64 

62 

60 

58 

56 

54 

52 

lul 

.975 

79 

78 

76 

75 

74 

72 

70 

69 

67 

65 

63 

62 

60 

58 

56 

53 

102 

2.035 

80 

79 

78 

76 

75 

73 

72 

70 

68 

67 

65 

63 

61 

59 

57 

55 

103 

.097 

82 

80 

79 

77 

76 

74 

73 

71 

70 

68 

66 

64 

62 

61 

59 

56 

104 

.160 

83 

81 

80 

79 

77 

76 

74 

72 

71 

69 

67 

66 

64 

62 

60 

58 

105 

2.  225 

84 

83 

81 

80 

78 

77 

75 

74 

72 

70 

69 

67 

65 

03 

62 

60 

100 

.292 

85 

84 

82 

81 

79 

78 

76 

75 

73 

72 

70 

68 

67 

65 

63 

61 

107 

.360 

86 

85 

83 

82 

81 

79 

78 

76 

75 

73 

71 

70 

68 

66 

64 

62 

108 

.431 

87 

86 

85 

83 

82 

80 

79 

77 

76 

74 

73 

71 

69 

68 

66 

64 

109 

.  503 

88 

87 

86 

84 

83 

81 

80 

79 

77 

75 

74 

72 

71 

69 

67 

65 

110 

2.576 

89 

88 

87 

85 

84 

83 

81 

80 

78 

77 

75 

74 

72 

70 

69 

67 

111 

.652 

91 

89 

88 

87 

85 

84 

82 

81 

79 

78 

76 

75 

73 

72 

70 

68 

112 

.730 

92 

90 

89 

88 

86 

85 

84 

82 

81 

79 

78 

76 

74 

73 

71 

70 

113 

.810 

93 

91 

90 

89 

87 

86 

85 

83 

82 

80 

79 

77 

76 

74 

73 

71 

114 

.891 

94 

93 

91 

90 

89 

87 

86 

84 

83 

82 

80 

79 

77 

75 

74 

72 

115 

2.975 

95 

94 

92 

91 

90 

88 

87 

86 

84 

83 

81 

80 

78 

77 

75 

74 

116 

3.061 

96 

95 

93 

92 

91 

89 

88 

87 

85 

84 

82 

81 

80 

78 

76 

75 

117 

.148 

97 

96 

95 

93 

92 

91 

89 

88 

87 

85 

84 

82 

81 

79 

78 

76 

118 

.239 

98 

97 

96 

94 

93 

92 

90 

89 

88 

86 

85 

83 

82 

80 

79 

77 

119 

.331 

99 

98 

97 

95 

94 

93 

92 

90 

89 

87 

86 

85 

83 

82 

80 

79 

120 

3.425 

100 

99 

98 

97 

95 

94 

93 

91 

90 

89 

87 

86 

84 

83 

81 

80 

121 

.522 

101 

100 

99 

98 

96 

95 

94 

92 

91 

90 

88 

87 

86 

84 

83 

81 

122 

.621 

102 

101 

100 

99 

97 

96 

95 

94 

92 

91 

90 

88 

87 

85 

84 

82 

123 

.723 

104 

102 

101 

100 

99 

97 

96 

95 

93 

92 

91 

89 

88 

86 

85 

84 

124 

.827 

105 

103 

102 

101 

100 

98 

97 

96 

94 

93 

92 

90 

89 

88 

86 

85 

125 

3.  933 

106 

104 

103 

102 

101 

99 

98 

97 

96 

94 

93 

92 

90 

89 

87 

86 

120 

4.  042 

107 

106 

104 

103 

102 

101 

99 

98 

97 

95 

94 

93 

91 

90 

89 

87 

127 

.154 

108 

107 

105 

104 

103 

102 

100 

99 

98 

97 

95 

94 

93 

91 

90 

88 

128 

.268 

109 

108 

106 

105 

104 

103 

101 

100 

99 

1)8 

96 

95 

94 

92 

91 

90 

129 

.385 

110 

109 

107 

106 

105 

104 

103 

101 

100 

99 

98 

96 

95 

94 

92 

91 

130 

4.504 

111 

110 

109 

107 

106 

105 

104 

102 

101 

100 

99 

97 

96 

95 

94 

92 

131 

.627 

112 

111 

110 

108 

107 

106 

105 

104 

102 

101 

100 

98 

97 

96 

95 

93 

132 

.752 

113 

112 

111 

109 

108 

107 

106 

105 

103 

102 

101 

100 

98 

97 

96 

94 

133 

4.880 

114 

113 

112 

111 

109 

108 

107 

100 

104 

103 

102 

101 

99 

98 

97 

95 

134 

5.011 

115 

114 

113 

112 

110 

109 

108 

107 

106 

104 

103 

102 

101 

99 

98 

97 

135 

5.145 

116 

115 

114 

113 

111 

110 

109 

108 

107 

105 

104 

103 

102 

100 

99 

98 

136 

.282 

117 

116 

115 

114 

113 

111 

110 

109 

108 

106 

105 

104 

103 

101 

100 

99 

137 

.422 

118 

117 

116 

115 

114 

112 

111 

110 

109 

108 

106 

105 

104 

103 

101 

100 

138 

.565 

119 

118 

117 

116 

115 

113 

112 

111 

110 

109 

107 

106 

105 

104 

102 

101 

139 

.712 

120 

119 

118 

117 

116 

115 

113 

112 

111 

110 

109 

107 

106 

105 

104 

102 

140 

5.862 

121 

120 

119 

118 

117 

116 

114 

113 

112 

111 

110 

108 

107 

106 

105 

103 

TABLE  IV. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

ire  =  25.0  inches. 


Air 
temp. 
t 

Taper 
press. 

e 

Depression  of  wet-bulb  thermometer  (<—<')• 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

46 

47 

48 

80 

1.022 

—16 

81 

.056 

—  5 

—30 

82 

.091 

+  1 

—13 

83 

.127 

7 

—  4 

—24 

84 

.163 

11 

+  3 

—10 

85 

1.201 

15 

8 

—  2 

—19 

86 

.241 

18 

12 

+  5 

—  7 

—42 

87 

.281 

21 

16 

10 

+  1 

—16 

88 

.322 

24 

20 

14 

7 

—  4 

—30 

89 

.364 

27 

22 

18 

11 

+  3 

—11 

90 

1.408 

29 

26 

21 

15 

8 

—  2 

—22 

91 

.453 

31 

28 

24 

19 

13 

+  5 

Q 

—50 

92 

.499 

34 

30 

26 

22 

17 

10 

±  o 

—16 

93 

.546 

36 

32 

29 

25 

20 

14 

+  7 

—  5 

—31 

94 

.595 

38 

35 

31 

27 

23 

18 

12 

+  3 

—11 

95 

1.645 

40 

37 

33 

30 

26 

21 

16 

9 

—  1 

—22 

96 

.696 

42 

39 

36 

32 

29 

24 

20 

14 

+  6 

-  7 

—51 

97 

.749 

44 

41 

38 

34 

31 

27 

23 

18 

11 

+  2 

—16 

98 

.803 

46 

43 

40 

37 

33 

30 

26 

21 

15 

8 

—  3 

—29 

99 

.859 

48 

45 

42 

39 

36 

32 

28 

24 

19 

13 

+  4 

—10 

100 

1.916 

49 

47 

44 

41 

38 

35 

31 

27 

23 

17 

10 

±  o 

—19 

101 

1.975 

51 

49 

46 

43 

40 

37 

34 

30 

26 

21 

15 

+  7 

—  5 

—40 

102 

2.035 

53 

50 

48 

45 

42 

39 

36 

32 

28 

24 

19 

12 

+  3 

—12 

103 

.097 

54 

52 

50 

47 

44 

41 

38 

35 

31 

27 

22 

17 

10 

—  1 

—24 

104 

.160 

56 

54 

51 

49 

46 

43 

40 

37 

34 

30 

26 

21 

14 

+  6 

—  7 

105 

2.225 

57 

55 

53 

51 

48 

45 

43 

39 

36 

32 

28 

24 

19 

12 

+  2 

—15 

106 

.292 

59 

67 

55 

52 

50 

47 

45 

42 

38 

35 

31 

27 

22 

17 

9 

—  2 

107 

.360 

61 

58 

56 

54 

52 

49 

47 

44 

41 

37 

34 

30 

26 

21 

14 

+  6 

108 

.431 

62 

60 

58 

56 

54 

51 

49 

46 

43 

40 

36 

32 

29 

24 

19 

12 

109 

.503 

63 

62 

60 

57 

55 

53 

60 

48 

45 

42 

39 

35 

31 

27 

22 

17 

110 

2.576 

65 

63 

61 

59 

57 

55 

52 

50 

47 

44 

41 

38 

34 

30 

26 

21 

111 

.652 

66 

64 

63 

61 

58 

56 

54 

52 

49 

46 

43 

40 

37 

33 

29  i   24 

112 

.730 

68 

66 

64 

62 

60 

58 

56 

53 

51 

48 

46 

43 

39 

36 

32    27 

113 

.810 

69 

67 

65 

64 

62 

60 

57 

55 

53 

50 

48 

45 

42 

38 

34 

30 

114 

.891 

70 

69 

67 

65 

63 

61 

59 

57 

54 

52 

50 

47 

44 

41 

37 

33 

115 

2.975 

72 

70 

68 

66 

65 

63 

61 

58 

56 

54 

51 

49 

46 

43 

40 

36 

116 

3.061 

73 

71 

70 

68 

66 

64 

62 

60 

58 

56 

53 

51 

48 

45 

42  :   39 

117 

.148 

74 

73 

71 

69 

68 

66 

64 

62 

60 

57 

55 

53 

50 

47 

44    41 

118 

.239 

76 

74 

72 

71 

69 

67 

65 

63 

61 

59 

57 

54 

52 

49 

46    43 

119 

.331 

77 

75 

74 

72 

70 

69 

67 

65 

63 

61 

58 

56 

54 

51 

48    46 

120 

3.425 

78 

77 

78 

73 

72 

70 

68 

66 

64 

62 

60 

58 

56 

53 

51    48 

121 

.522 

80 

78 

76 

75 

73 

71 

70 

68 

66 

64 

62 

60 

57 

55 

53 

60 

122 

.621 

81 

79 

78 

76 

74 

73 

71 

69 

67 

65 

63 

61 

59 

57 

54 

52 

123 

.723 

82 

81 

79 

77 

76 

74 

72 

71 

69 

67 

65 

63 

61 

59 

56 

54 

124 

.827 

83 

82 

80 

79 

77 

76 

74 

72 

70 

68 

66 

64 

62 

60 

58 

56 

125 

3.933 

85 

83 

82 

80 

78 

77 

75 

73 

72 

70 

68 

66 

64 

62 

60 

58 

126 

4.042 

86 

84 

83 

81 

80 

78 

76 

75 

73 

71 

69 

68 

66 

64 

61 

59 

127 

.154 

87 

86 

84 

83 

81 

79 

78 

76 

74 

73 

71 

69 

67 

65 

63 

61 

128 

.268 

88 

87 

85 

84 

82 

81 

79 

77 

76 

74 

72 

71 

69 

67 

65 

63 

129 

.385 

89 

88 

87 

85 

84 

82 

80 

79 

77 

76 

74 

72 

70 

68 

66 

64 

130 

4.504 

91 

89 

88 

86 

85 

83 

82 

80 

79 

77 

75 

74 

72 

70 

68 

66 

131 

.627 

92 

90 

89 

88 

86 

85 

83 

81 

80 

78 

77 

75 

73 

71 

69 

68 

132 

.752 

93 

92 

90 

89 

87 

86 

84 

83 

81 

80 

78 

76 

-75 

73 

71 

69 

133 

4.880 

94 

93 

91 

90 

88 

87 

86 

84 

82 

81 

79 

78 

76 

74 

72 

71 

134 

5.011 

95 

94 

93 

91 

90 

88 

87 

85 

84 

82 

81 

79 

77 

76 

74 

72 

135 

5.145 

96 

95 

94 

92 

91 

90 

88 

87 

85 

84 

82 

80 

79 

77 

75 

T4 

136 

.282 

98 

96 

95 

94 

92 

91 

89 

88 

86 

85 

83 

82 

80 

78 

77 

75 

137 

.422 

99 

97 

96 

95 

93 

92 

91 

89 

88 

86 

85 

83 

81 

80 

78 

76 

138 

.565 

100 

99 

97 

96 

95 

98 

92 

90 

89 

87 

86 

84 

83 

81 

80 

78 

139 

.712 

101 

100 

98 

97 

96 

94 

93 

92 

90 

89 

87 

86 

84 

82 

81 

79 

140 

6.862 

102 

101 

100 

98 

97 

96 

94 

93 

91 

90 

88 

87 

85 

84 

82 

81 

DEW-POINT. 

49 

TABLE  V. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  23.0  inches. 


Depression  of  wet-bulb  thermometer  (<—<')• 

Air 

Vapor 

temp. 

)ress. 

t 

e 

.2 

.4 

.6 

.8 

.0 

.2 

1.4 

1.6 

1.8 

2.2 

2.4 

2.6 

2.8 

3.0 

—40 

.0039 

—49 

—39 

00 

41 

AA 

—48 

AC 

CQ 

(t-f) 

—  oo 

—37 

YX 

46 

4:U 

—45 

—  o» 
—57 

t 

€ 

t 

c 

.1 

.2 

.3 

.4 

.5 

—  36 

48 

—  43 

—  55 

—35 
—34 

.0051 
54 

—42 
—40 

—52 
—50 

—60   . 
—59 

CO 

0010 

11 

19 

—52 
—51 

.0018 
19 

—60 
—59 

—33 

57 

—39 

—48 

—  Oo 

57 

\L 
13 

—50 

.0021 

—58 

—32 

61 

—38 

—46 

—59 

f\A 

-iq 

—  49 

22 

—56 

-31 

65 

—36 

—44 

—55 

—  Ou 

lo 

—48 

24 

—54 

—55   . 

0015 

47 

26 

—53 

—30 

.0069 

—34 

—42 

—52 

—54 

16 

—46 

27 

—51 

—59 

—29 
28 

74 

78 

—33 

—40 
—  38 

—49 

—  46 

—60 

—  53 

0017 

—45 
44 

.0029 
31 

—50 
^g 

—57 
55 

—27 

83 

—30 

—36 

—44 

-55 

—43 

33 

—47 

—53 

—26 

89 

—29 

—34 

—41 

-51 

—42 

35 

—46 

—51 

—60 

—41 

37 

—45 

—50 

—58 

—25 
—24 

.0094 
.0100 

—28 
—27 

—32 
—31 

—39 
—36 

—48 
—45 

—57 

—40 
39 

.0039 
41 

—44 

—43 

—49 
—48 

—56 

—54 

—23 
—22 

106 
112 

—26 
—25 

—30 
—29 

—34 
—33 

—42 
—39 

—51 
-47 

—38 
—37 

44 

46 

—42 
—41 

—46 
—45 

—52 
—50 

—59 
—57 

—21 

119 

—24 

—27 

—31 

—36 

—44 

—57 

—36 

48 

—40 

—43 

-49 

—55 

—20 
—19 
—18 
—17 
—16 

.0126 
133 
141 
150 
159 

—23 
—22 
—20 
—19 

—18 

—26 
—24 
—23 
—22 

—20 

—29 
—28 
—26 
—25 
—23 

—34 
-32 
—30 
—28 
—26 

—40 
—37 
—35 
—32 
—30 

—51 
—47 
—43 
—39 
—35 

—54 

—48 
—43 

—57 

—35 
—34 
-33 
—32 
—31 
—30 

.0051 
54 
57 
61 
65 
.0069 

—39 
—37 
—36 
—35 
—33 
—32 

—42 
—40 
—39 
—38 
—36 
—34 

—47 
—  45 
—43 
—42 
—40 
—38 

^-52 
—50 
—48 
—46 
—44 
—42 

-58 
—55 
—52 
—49 
—47 

—14 

.0168 
178 

—16 

—18 

—20 

—23 

-26 

—  33 

—30 

—39 
—36 

—  44 

—57 

—13 

188 

—15 

—17 

—19 

—22 

—25 

-28 

—33 

—39 

—49 

—12 

199 

—14 

—16 

—18 

—20 

—23 

—26 

—30 

—35 

—43 

—56 

—11 

210 

—13 

—14 

—16 

—19 

—21 

—24 

—28 

—32 

—39 

—48 

—10 

.0222 

—12 

—13 

—15 

—17 

—20 

—22 

—26 

—29 

—34 

—42 

—55 

—  9 

234 

—11 

—12 

—14 

—16 

—18 

-21 

—24 

—27 

—31 

—37 

—46 

—  8 

247 

—10 

—11 

—13 

—15 

—17 

—19 

—22 

—25 

—29 

—33 

—40 

—50 

—  7 

260 

—  8 

—10 

—12 

—14 

—15 

—17 

—20 

—23 

—26 

—30 

—35 

—44 

—56 

—  6 

275 

fj 

—  9 

—10 

—12 

—14 

—16 

—18 

—21 

—24 

—27 

—32 

—38 

—47 

—  5 

.0291 

—  6 

—  8 

t     Q 

—11 

—12 

—14 

—16 

—19 

—22 

—25 

—29 

—33 

—40 

—51 

—  4 

307 

—  5 

—  6 

—  8 

—10 

—11 

—13 

—15 

—17 

—19 

—22 

—26 

—30 

—35 

—43 

-57 

—  3 

325 

—  4 

—  5 

—  7 

—  8 

—10 

—11 

—13 

—15 

—17 

—20 

—23 

—26 

—31 

—37 

—46 

—  2 

344 

—  3 

A 

—  6 

—  7 

—  8 

—10 

—12 

-14 

—16 

—18 

—20 

—23 

—27 

-32 

—38 

—  1 

363 

—  2 

—  3 

—  4 

—  6 

—  7 

—  8 

—10 

—12 

—14 

—16 

-18 

—21 

—24 

—28 

—32 

0 

.0383 

—  1 

—  2 

—  3 

—  4 

—  6 

—  7 

—  9 

—10 

—12 

—14 

—16 

—18 

—21 

—24 

—28 

-*•  1 

403 

4-  0 

—  1 

—  5 

—  3 

—  4 

—  6 

Y 

—  9 

—10 

—12 

—14 

—16 

—19 

—22 

—25 

423 

+  1 

±  0 

—  1 

—  2 

3 

—  4 

—  6 

—  7 

—  9 

—10 

—12 

—14 

-16 

—19 

—22 

fl 

444 

2 

+  1 

-4-  0 

—  1 

—  2 

—  3 

—  4 

—  6 

—  7 

—  9 

—10 

—12 

—14 

—16 

—19 

4 

467 

3 

2 

+  1 

±  0 

T 

—  2 

—  3 

—  5 

—  6 

—  7 

—  9 

—10 

—12 

—14 

—16 

5 

.0491 

4 

3 

2 

-J-  1 

±  0 

—  1 

—  2 

—  3 

—  5 

—  6 

»T 

—  9 

—10 

—12 

—14 

6 

515 

5 

4 

j 

+  1 

±  0 

—  1 

—  2 

—  3 

—  4 

—  6 

—  7 

—  9 

—10 

—12 

\ 

542 

6 

5 

i 

3 

2 

+  1 

±  0 

j 

—  2 

—  3 

-  4 

—  5 

—  7 

-  9 

—10 

i 

570 

7 

6 

( 

5 

4 

3 

+  2 

+  1 

—  1 

—  2 

—  3 

—  4 

—  5 

—  7 

—  8 

J 

600 

8 

7 

? 

6 

5 

4 

3 

2 

+  1 

±  0 

—  1 

—  3 

—  4 

—  5 

—  7 

10 

.0631 

9 

9 

i 

7 

6 

5 

4 

3 

2 

+  1 

±  o 

—  1 

—  2 

—  4 

—  5 

11 

665 

10 

10 

8 

\ 

6 

5 

5 

4 

3 

+  1 

-t-  0 

—  1 

—  2 

—  3 

12 

699 

11 

11 

10 

« 

8 

8 

7 

6 

5 

4 

3 

+  2 

+  1 

db  0 

—  2 

13 

735 

12 

12 

11 

10 

10 

9 

8 

7 

6 

5 

4 

3 

2 

+  1 

±  0 

14 

772 

13 

13 

12 

11 

11 

10 

9 

8 

8 

7 

6 

5 

4 

3 

+  2 

15 

.0810 

14 

14 

13 

12 

12 

11 

10 

10 

9 

8 

7 

6 

5 

4 

3 

16 

850 

15 

15 

14 

13 

13 

12 

11 

11 

10 

9 

8 

8 

7 

6 

5 

17 

89 

16 

16 

15 

14 

14 

13 

13 

12 

11 

10 

10 

9 

8 

7 

6 

18 

93 

17 

17 

1 

16 

15 

14 

14 

13 

12 

12 

11 

10 

9 

8 

8 

19 

.097 

18 

18 

17 

17 

16 

15 

15 

14 

13 

13 

12 

11 

11 

10 

9 

20 

.102 

19 

19 

18 

18 

17 

16 

16 

15 

15 

14 

13 

'  12 

12 

11 

10 

9161°— 15 4 


50 


TABLE  V. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  23.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

t 

3.2 

3.4 

3.6 

3.8 

4 

0 

4.2 

4.4 

4.6 

4 

8 

5.0 

5.2 

5.4 

5.6 

5.8 

6.0 

—2 

—49 

—1 

—40 

—51 

0 

—33 

—41 

—52 

+1 

—29 

—83 

—42 

—54 

2 

—25 

—29 

—34 

— 

43 

— 

56 

3 

—22 

—25 

—29 



:u 



4:', 

_ 

-58 

4 

—19 

—22 

—25 

—29 

—35 

—44 

—59 

5 

—17 

—19 

—22 

—25 

2l> 

—35 

—45 

—60 

6 

—14 

—17 

—19 



22 

— 

25 

-30 

-38 

-45 

— 

60 

7 

—12 

—14 

—16 

19 

22 

-25 

-?,0 

— 

•38 



45 

8 

—10 

-12 

—14 

—16 

—19 

—22 

—25 

—29 

—35 

—45 

9 

—  8 

—10 

—12 

—14 

—16 

—19 

—21 

—25 

- 

2!) 

—35 

—44 

—60 

10 

—  0 

—  8 

—10 

—12 

—14 

—16 

—18 

—21 



2-1 



29 

—34 

—43 

—59 

11 

—  5 

—  6 

Y 

9 

—11 

—13 

—15 

—18 

—20 

—24 

—28 

—33 

—42 

—56 

12 

—  3 

—  4 

—  5 



7 



<J 

-11 

-1:5 

15 

— 

17 

— 

2(1 

—23 

—27 

—32 

—40 

—53 

13 

I 

2 

—  4 

_ 

5 

7 

-  8 

—10 

-12 

—14 

—17 

—19 

—22 

—26 

—31 

—38 

14 

±  0 

—  1 

—  2 

•  3 

- 

5 

-  6 

-  8 

-  9 

—11 

—13 

—16 

—18 

—21 

—25 

—29 

15 

+  2 

+  1 

±  0 



1 

_ 

8 

-  4 

-  5 

-  7 



9 

—11 

—13 

—15 

—17 

—20 

—24 

16 

4 

3 

+  2 

±  0 

1 

-  2 

-  3 

-  5 

6 

— 

8 

—10 

—12 

—14 

—16 

-19 

17 

5 

4 

3 

_|- 

2 

-f 

1 

d 

:    0 

-  2 

-  3 

4 

— 

5 

—  7 

-  9 

—11 

—13 

—15 

18 

7 

6 

5 

4 

8 

+  2 

±  0 

1 

_ 

2 

— 

8 

—  5 

—  6 

—  8 

—10 

—12 

19 

8 

7 

6 

5 

4 

3 

+  2 

+  I 

4- 

0 

— 

1 

—  3 

A 

—  5 

—  7 

Q 

20 

9 

9 

8 

7 

6 

5 

4 

3 

+ 

2 

+ 

1 

T 

—  2 

—  3 

—  5 

—  6 

t 

«- 

-o 

6.2 

6.4 

3.6 

6.8 

7.0 

7.2 

7.4 

7.  6       7.  8 

8.0 

13 

—49 

14 

—36 

—47 

15 

—28 

—34 

—44 

—59 

• 

16 

—22 

—27 

—32 

-40 

—53 

17 

—18 

—21 

—25 

—29 

—36 

—47 

18 

—14 

—17 

—20 

—23 

—27 

—33 

-42 

—58 

19 

—11 

—13 

—16 

—18 

—21 

—25 

—30 

—37     —49 

20 

—  8 

—10 

—12 

—14 

—17 

—20 

—23 

—28     —33 

—44 

DEW-POINT. 
51 

TABLE  V. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  23.0  inches. 


Air 

Vapor 

Depression  of  wet-bulb  thermometer  (<—<'). 

t 

e 

0.  5 

l.o 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

20 

0.1"3 

1!) 

17 

16 

14 

12 

10 

8 

6 

3 

1 

—3 

-6 

—11 

—17 

—26 

—44 

21 

.108 

20 

18 

17 

15 

13 

12 

10 

8 

5 

2 

—1 

—4 

—  8 

—13 

—20 

—30 

22 

.113 

21 

19 

18 

16 

15 

13 

11 

9 

7 

4 

+1 

—2 

—  5 

—10 

—15 

—23 

23 

.118 

22 

20 

19 

17 

16 

14 

12 

10 

8 

6 

3 

±0 

—  3 

—  7  —12 

—18 

24 

.124 

23 

21 

20 

19 

17 

15 

14 

12 

10 

8 

5 

+2 

T 

—  4 

—  8 

—14 

25 

0.130 

24 

23 

21 

20 

18 

17 

15 

13 

11 

9 

7 

4 

+  1 

—  2 

—  5 

—10 

26 

.136 

25 

24 

22 

21 

20 

18 

16 

15 

13 

11 

9 

6 

4 

+  1 

—  3 

—  7 

27 

.143 

26 

25 

23 

22 

21 

19 

18 

16 

14 

12 

10 

8 

6 

3 

+  0 

—  4 

28 

.160 

27 

26 

24 

23 

22 

20 

19 

17 

16 

14 

12 

10 

8 

5 

4-  2 

—  1 

29 

.157 

28 

27 

26 

24 

23 

22 

20 

19 

17 

15 

13 

11 

9 

7 

4 

+  1 

30 

0.164 

29 

28 

27 

25 

24 

23 

21 

20 

18 

17 

15 

13 

11 

9 

7 

4 

31 

.172 

30 

29 

28 

27 

25 

24 

23 

21 

20 

18 

17 

15 

13 

11 

8 

6 

32 

.180 

31 

30 

29 

28 

26 

25 

24 

23 

21 

20 

18 

16 

14 

12 

10 

8 

33 

.187 

32 

31 

30 

29 

28 

26 

25 

24 

22 

21 

19 

18 

16 

14 

12 

10 

34 

.195 

33 

32 

31 

30 

29 

28 

26 

25 

24 

22 

21 

19 

18 

16 

14 

12 

35 

0.203 

34 

33 

32 

31 

30 

29 

28 

26 

25 

24 

22 

21 

19 

17 

16 

14 

36 

.211 

35 

34 

33 

32 

31 

30 

29 

27 

26 

25 

24 

22 

21 

19 

17 

16 

37 

.219 

36 

35 

34 

33 

32 

31 

30 

28 

27 

26 

25 

24 

22 

20 

19 

17 

38 

.228 

37 

36 

35 

34 

33 

32 

31 

30 

28 

27 

26 

25 

23 

22 

20 

IB 

39 

.237 

38   37   36 

35 

34 

33 

32 

31 

30 

28 

27 

26 

25 

23 

22 

20 

40 

0.247 

39   38   37 

36 

35 

34 

33 

32 

31 

30 

28 

27 

26 

25 

23 

22 

41 

.256 

40  :  I',!)   38 

37 

36 

35 

34 

33 

32 

31 

29 

28 

27 

26 

24 

23 

42 

.266 

41  |  40  |  39 

38 

37 

36 

35 

34 

33 

32 

31 

29 

28 

27 

26 

24 

43 

.277 

42 

41 

40 

39 

38 

37 

36 

35 

34 

33 

32 

31 

29 

28 

27 

26 

44 

.287 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

33 

32 

31 

29 

28 

27 

45 

0.298 

44 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

33 

32 

31 

29 

28 

46 

.310 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

33 

32 

31 

30 

47 

.322 

46 

45 

44 

43 

42 

42 

41 

40 

38 

37 

36 

35 

34 

33 

32 

31 

48 

.334 

47 

46 

45 

44 

44 

43 

42 

41 

40 

39 

38 

37 

35 

34 

33 

32 

49 

.347 

48 

47 

46 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

34 

33 

50 

0.360 

49 

48 

47 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

34 

51 

.373 

50 

49 

48 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

52 

.387 

51 

50 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

53 

.402 

52 

51 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

54 

.417 

53 

52 

52 

51 

50 

49 

48 

47 

46 

45 

44 

44 

43 

42 

41 

40 

55 

0.432 

54 

53 

53 

52 

51 

50 

49 

48 

48 

47 

46 

45 

44 

43 

42 

41 

56 

.448 

55 

54 

54 

53 

52 

51 

50 

49 

49 

48 

47 

46 

45 

44 

43 

42 

57 

.465 

66 

56 

55 

54 

53 

52 

51 

50 

50 

49 

48 

47 

46 

45 

44 

43 

58 

.482 

57 

57 

56 

55 

54 

53 

52 

52 

51 

50 

49 

48 

47 

46 

45 

44 

59 

.499 

58 

58 

57 

56 

55 

54 

54 

53 

52 

51 

50 

49 

48 

47 

46 

46 

60 

0.517 

59 

59 

58 

57 

56 

55 

55 

54 

53 

52 

51 

50 

49 

49 

48 

47 

61 

.536 

60 

60 

59 

58 

57 

56 

56 

55 

54 

53 

52 

52 

51 

50 

49 

48 

62 

.555 

61 

61 

60 

59 

58 

58 

57 

56 

55 

54 

53 

53 

52 

51 

50 

49 

63 

.575 

62 

62 

61 

60 

59 

59 

58 

57 

56 

55 

56 

54 

53 

52 

51 

•  50 

64 

.595 

63 

63 

62 

61 

60 

60 

59 

58 

57 

56 

56 

55 

54 

53 

52 

51. 

65 

0.616 

64 

64 

63 

62 

61 

61 

60 

59 

58 

58 

57 

56 

55 

54 

54 

53 

66 

.638 

65 

65 

64 

63 

62 

62 

61 

60 

59 

59 

58 

57 

56 

55 

55 

54 

67 

.661 

66 

66 

65 

64 

63 

63 

62 

61 

61 

60 

59 

58 

57 

57 

56 

55 

68 

.684 

87 

67 

66 

65 

64 

64 

63 

62 

62 

61 

60 

59 

58 

58 

57 

56 

69 

.707 

68 

68 

67 

66 

66 

65 

64 

63 

63 

62 

61 

60 

60 

59 

58 

57 

70 

0.732 

69 

69 

68 

67 

67 

66 

65 

64 

64 

63 

62 

61 

61 

60 

59 

58 

71 

.757 

70 

70 

69 

68 

68 

67 

66 

66 

65 

64 

63 

62 

62 

61 

60 

59 

72 

.783 

71 

71 

70 

69 

69 

68 

67 

67 

66 

65 

64 

64 

63 

62 

61 

60 

73 

.810 

72 

72 

71 

70 

70 

69 

68 

68 

67 

66 

65 

65 

64 

63 

62 

62 

74 

.838 

73 

73 

72 

71 

71 

70 

69 

69 

68 

67 

66 

66 

65 

64 

64 

63 

75 

0.866 

74 

74 

73 

72 

72 

71 

70 

70 

69 

68 

67 

67 

66 

65 

65 

64 

76 

.896 

75 

75 

74 

73 

73 

72 

71 

71 

70 

69 

69 

68 

67 

66 

66 

65 

77 

.926 

76 

76 

75 

74 

74 

73 

72 

72 

71 

70 

70 

69 

68 

67 

67 

66 

78 

.957 

77 

77 

76 

75 

75 

74 

73 

73 

72 

71 

71 

70 

69 

69 

68 

67 

79 

0.989 

78 

78 

77 

76 

76 

75 

74 

74 

73 

72 

72 

71 

70 

70 

69 

68 

80 

1.022 

79 

79 

78 

77 

77 

76 

75 

75 

74 

73 

73 

72 

71 

71 

70 

69 

DEW-POINT. 

53 

TABLE  V. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  23.0  inches. 


Air 

temp. 

t. 

Vapor 
press. 
e. 

Depression  of  wet-bulb  thermometer  (t—  t'). 

8.5 

9.0 

9.5 

10.0 

10.5 

11.0 

11.5 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

15.0 

15.5 

16.0 

22 

0.113 

—37 

23 

.118 

—28 

—50 

24 

.124 

—21 

—32 

25 

0.130 

—16 

—24 

—42 

26 

.136 

—12 

—18 

—29 

—56 

27 

.143 

—  8 

—14 

—21 

—34 

28 

.150 

—  5 

—10 

-16 

—24 

-43 

29 

.157 

—  2 

—  6 

—11 

—18 

—29 

-57 

30 

0.164 

±  0 

—  3 

—  7 

—13 

—21 

-33 

31 

.172 

+  3 

±  0 

—  4 

—  9 

—15 

-23 

—40 

32 

.180 

5 

+  2 

—  1 

-  5 

—10 

—16 

—26 

-50 

33 

.187 

8 

5 

+  2 

—  2 

—  6 

—11 

—18 

—30 

34 

.195 

10 

7 

4 

+  1 

—  3 

—  7 

—12 

—20 

—34 

35 

0.203 

12 

9 

7 

4 

±  0 

—  3 

—  8 

—14 

—22 

-40 

36 

.211 

13 

11 

9 

6 

+  3 

±  0 

—  4 

—  9 

—15 

-25 

—47 

37 

.219 

15 

13 

11 

9 

6 

+  3 

—  1 

—  5 

—10 

—17 

—28 

—60 

38 

.228 

17 

15 

13 

11 

8 

6 

+  2 

-I 

—  5 

—11 

—18 

—31 

39 

.237 

19 

17 

15 

13 

11 

8 

5 

+  2 

—  2 

—  6 

—12 

—20 

—34 

40 

0.247 

20 

19 

17 

15 

13 

10 

8 

5 

+  1 

—  2 

—  7 

—13 

—22 

—39 

41 

.256 

22 

20 

19 

17 

15 

12 

10 

8 

5 

+  1 

—  3 

—  8 

—14 

-23 

—45 

42 

.266 

23 

22 

20 

18 

17 

14 

12 

10 

7 

4 

+  1 

—  3 

—  8 

—15 

—25 

—50 

43 

.277 

24 

23 

22 

20 

18 

16 

14 

12 

10 

7 

4 

±  0 

—  4 

—  9 

—16 

—27 

44 

.287 

26 

24 

23 

22 

20 

18 

16 

14 

12 

10 

7 

+  4 

±  o 

—  4 

—10 

—17 

45 

0.298 

27 

26 

24 

23 

21 

20 

18 

16 

14 

12 

10 

7 

+  * 

±  o 

—  5 

-10 

46 

.310 

28 

27 

26 

24 

23 

21 

20 

18 

16 

14 

12 

10 

7 

+  3 

—  1 

—  5 

47 

.322 

30 

28 

27 

26 

24 

23 

21 

20 

18 

16 

14 

12 

9 

7 

+  3 

—  1 

48 

.334 

31 

30 

28 

27 

26 

24 

23 

21 

20 

18 

16 

14 

12 

9 

6 

+  3 

49 

.347 

32 

31 

30 

28 

27 

26 

24 

23 

21 

20 

18 

16 

14 

11 

9 

6 

50 

0.360 

33 

32 

31 

30 

28 

27 

26 

24 

23 

21 

20 

18 

16 

14 

11 

9 

51 

.373 

34 

33 

32 

31 

30 

29 

27 

26 

24 

23 

21 

20 

18 

16 

14 

11 

52 

.387 

36 

35 

34 

32 

31 

30 

29 

27 

26 

24 

23 

21 

20 

18 

16 

14 

53 

.402 

37 

36 

35 

34 

32 

31 

30 

29 

27 

26 

25 

23 

21 

20 

18 

16 

64 

.417 

38 

37 

30 

35 

34 

32 

31 

30 

29 

27 

26 

25 

23 

21 

20 

18 

55 

0.432 

40 

39 

38 

36 

35 

34 

32 

31 

30 

29' 

27 

26 

25 

23 

22 

20 

56 

.448 

41 

40 

39 

38 

36 

35 

34 

33 

31 

30 

29 

28 

26 

25 

23 

22 

57 

.465 

42 

41 

40 

39 

38 

37 

35 

34 

33 

32 

30 

29 

28 

26 

25 

23 

58 

.482 

43 

42 

41 

40 

39 

38 

37 

36 

34 

33 

32 

31 

29 

28 

26 

25 

59 

.499 

45 

44 

43 

42 

40 

39 

38 

37 

36 

35 

33 

32 

31 

29 

28 

27 

60 

0.517 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

35 

33 

32 

31 

30 

28 

61 

.536 

47 

46 

45 

44 

43 

42 

41 

40 

39 

37 

36 

35 

34 

32 

31 

30 

62 

.555 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

36 

35 

34 

32 

31 

63 

.575 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

35 

34 

33 

64 

.595 

50 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

39 

38 

37 

36 

34 

65 

0.616 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

66 

638 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

67 

.661 

54 

53 

52 

51 

50 

50 

49 

43 

47 

46 

45 

44 

42 

41 

40 

39 

68 

.684 

55 

54 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

40 

69 

.707 

56 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

70 

0.  732 

57 

57 

56 

55 

54 

53 

52 

51 

50 

50 

49 

48 

47 

46 

44 

43 

71 

.757 

59 

58 

57 

56 

55 

54 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

72 

.783 

60 

59 

58 

57 

56 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

73 

.810 

61 

60 

59 

58 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

74 

.838 

62 

61 

60 

60 

59 

58 

57 

56 

55 

54 

54 

53 

52 

51 

50 

49 

75 

0.866 

63 

62 

62 

61 

60 

59 

58 

57 

57 

56 

55 

54 

53 

52 

51 

50 

76 

.896 

64 

63 

63 

62 

61 

60 

59 

59 

58 

57 

56 

65 

54 

53 

52 

51 

77 

.926 

65 

65 

64 

63 

62 

61 

61 

60 

59 

58 

57 

56 

56 

55 

54 

53 

78 

.•957 

66 

66 

65 

64 

63 

63 

62 

61 

60 

59 

58 

58 

57 

56 

55 

54 

79 

.989 

67 

67 

66 

65 

64 

64 

63 

62 

61 

60 

60 

59 

58 

57 

56 

55 

80 

1.022 

69 

68 

67 

66 

66 

65 

64 

63 

62 

62 

61 

60 

59 

58 

58 

57 

DEW-POINT. 

53 

TABLE  V. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  23.0  inches. 


Air 

.  Depression  of  wet-bulb  thermometer  (t—f). 

temp. 
t 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

20.0 

20.5 

21.0 

21.5 

22.0 

22.5 

23.0 

23.5 

24.0 

44 

—29 

45 

—18 

—31 

46 

—11 

—19 

—33 

47 

—  5 

—11 

-20 

—35 

48 

—  1 

—  5 

—12 

—20 

—38 

49 

+  3 

—  1 

—  6 

—12 

—21 

—40 

50 

6 

4-  3 

_  i 

—  6 

—12 

—21 

—42 

51 

9 

6 

+  2 

—  2 

—  6 

—12 

-22 

—44 

52 

11 

9 

6 

+  2 

—  2 

—  7 

—13 

—22 

—46 

53 

14 

11 

9 

6 

+  2 

—  2 

—  7 

—14 

—23 

—47 

54 

16 

13 

11 

9 

6 

+  2 

—  2 

»T 

—14 

—24 

—50 

55 

18 

16 

14 

11 

8 

5 

+  2 

2 

-  7 

—14 

—25 

—55 

56 

20 

18 

16 

14 

11 

8 

5 

+  2 

—  2 

—  8 

—15 

—26 

—60 

57 

22 

20 

18 

16 

14 

11 

8 

5 

+  2 

—  3 

—  8 

—15 

—26 

58 

23 

22 

20 

18 

16 

14 

11 

9 

5 

+  2 

—  3 

—  8 

—15 

—27 

59 

25 

24 

22 

20 

18 

16 

14 

11 

9 

5 

+  2 

—  3 

-  8 

—  1H 

—28 

60 

27 

25 

24 

22 

20 

18 

16 

14 

11 

9 

6 

+  2 

—  3 

—  8 

-16 

—28 

61 

28 

27 

25 

24 

22 

20 

18 

16 

14 

12 

9 

6 

+  2 

—  3 

—  8 

—16 

62 

30 

28 

27 

26 

24 

22 

20 

19 

17 

14 

12 

9 

6 

+  2 

—  3 

—  8 

63 

32 

30 

29 

27 

26 

24 

22 

21 

19 

17 

14 

12 

9 

6 

+  2 

—  3 

64 

33 

32 

30 

29 

28 

26 

24 

23 

21 

19 

17 

15 

12 

9 

6 

+  2 

65 

35 

33 

32 

31 

29 

28 

26 

25 

23 

21 

19 

17 

15 

12 

10 

6 

66 

36 

35 

34 

32 

31 

29 

28 

27 

25 

23 

22 

19 

17 

15 

13 

10 

67 

38 

36 

35 

34 

32 

31 

30 

28 

27 

25 

24 

22 

20 

18 

15 

13 

68 

39 

38 

37 

35 

34 

33 

31 

30 

28 

27 

25 

24 

22 

20 

18 

16 

69 

41 

39 

38 

37 

36 

34 

33 

32 

30 

29 

27 

26 

24 

22 

20 

18 

70 

42 

41 

40 

38 

37 

36 

35 

33 

32 

31 

29 

27 

26 

24 

22 

20 

71 

44 

42 

41 

40 

39 

38 

36 

35 

34 

32 

31 

29 

28 

26 

25 

23 

T2 

45 

44 

43 

42 

40 

39 

38 

37 

35 

34 

32 

31 

29 

28 

27 

26 

73 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

34 

33 

31 

30 

28 

27 

74 

48 

47 

46 

45 

43 

42 

41 

40 

38 

37 

36 

34 

33 

32 

30 

29 

75 

49 

48 

47 

40 

45 

44 

43 

42 

40 

39 

38 

36 

35 

34 

32 

31 

76 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

39 

38 

37 

36 

34 

32 

77 

52 

51 

50 

49 

48 

47 

46 

44 

43 

42 

41 

40 

38 

37 

36 

34 

78 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

41 

40 

39 

37 

36 

79 

54 

54 

53 

52 

51 

50 

49 

47 

46 

45 

44 

43 

42 

40 

39 

38 

80 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

44 

43 

43 

41 

40 

I 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

24.5 

25.0 

25.5 

26.0 

26.5 

27.0 

27.5 

28.0 

28.5 

29.0  29.5 

30.0 

30.5 

31.0 

31.5 

32.0 

61 
62 

—16 

—29 

Ifi 

OQ 

(i-O 

64 

—  2 

lo 

—  7 

—  £o 

—15 

—28 

t 

32.5 

33.0 

33.5 

34.0 

34.5 

65 

+  2 

—  2 

—  7 

—15 

—28 

76 

33 

66 

67 

7 
10 

+  3 
7 

—  2 
+  3 

—  7 
—  1 

—15 

7 

—27 
—14 

—27 

77 
78 

—15 
6 

—30 
14 

28 

68 
69 

13 
16 

10 
13 

7 
11 

+  3 
8 

-i 

-r  * 

—  6 
—  1 

—14 
—  6 

—26 
—13 

—25 

79 
80 

±  o 

+  6 

—  5 

+  1 

—13 
—  4 

—26 
—11 

—23 

70 
71 

18 
21 

16 
19 

14 

17 

11 
14 

8 
11 

+  4 
8 

±  0 

+  5 

—  5 

+  0 

—13 
—  5 

—12 

—23 

—54 

72 

23 

21 

19 

17 

14 

12 

9 

+  5 

+  1 

A 

—11 

—22 

—50 

73 

25 

23 

22 

20 

17 

15 

12 

9 

6 

+  1 

—  4 

—11 

—20 

—45 

74 

27 

26 

24 

22 

20 

18 

15 

12 

10 

6 

+  2 

O 

-10 

—19 

-41 

75 

29 

28 

26 

24 

22 

20 

18 

15 

13 

10 

7 

+  2 

—  3 

—  9 

—18 

—37 

76 

31 

29 

28 

26 

24 

23 

21 

18 

16 

13 

10 

7 

+  3 

—  2 

—  8 

—  n 

77 

33 

31 

30 

28 

27 

25 

23 

21 

19 

16 

14 

11 

8 

+  4 

-  1 

—  7 

78 

35 

33 

32 

30. 

29 

27 

25 

23 

21 

19 

17 

14 

11 

8 

-f  4 

±  o 

79 

37 

35 

33 

32 

31 

29 

27 

26 

24 

22 

20 

17 

15 

12 

9 

+  5 

86 

38 

37 

35 

34 

32 

31 

29 

28 

26 

24 

22 

20 

18 

15 

12 

9 

DEW-POINT. 

54 

TABLE  V. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  23.0  inches. 


Air 

temp. 
t 

Vapor 
press. 

e 

Depression  of  wet-bulb  thermometer  (t—  t?). 

1 

2 

3 

4  * 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

80 

1.022 

79 

77 

76 

75 

73 

72 

71 

69 

68 

66 

65 

63 

62 

60 

58 

57 

81 

.056 

80 

78 

77 

76 

75 

73 

72 

70 

69 

67 

66 

64 

63 

61 

60 

58 

82 

.091 

81 

79 

78 

77 

76 

74 

73 

71 

70 

69 

67 

66 

64 

62 

61 

59 

83 

.127 

82 

81 

79 

78 

77 

75 

74 

72 

71 

70 

68 

67 

65 

64 

62 

60 

84 

.163 

83 

82 

80 

79 

78 

76 

75 

74 

72 

71 

69 

68 

66 

65 

63 

62 

85 

1.  201 

si 

83 

81 

80 

79 

77 

76 

75 

73 

72 

70 

69 

67 

66 

64 

63 

86 

.241 

85 

84 

82 

81 

80 

78 

77 

76 

74 

73 

72 

70 

69 

67 

66 

64 

87 

.281 

86 

85 

83 

82 

81 

79 

78 

77 

75 

74 

73 

71 

70 

68 

67 

65 

88 

.322 

87 

86 

84 

83 

82 

80 

79 

78 

76 

75 

74 

72 

71 

69 

68 

66 

89 

.364 

88 

87 

85 

84 

83 

82 

80 

79 

78 

76 

75 

73 

72 

71 

69 

67 

90 

1.408 

89 

88 

86 

85 

84 

83 

81 

80 

79 

77 

76 

75 

73 

72 

70 

69 

91 

.453 

90 

89 

87 

86 

85 

84 

82 

81 

80 

78 

77 

76  !  74 

73 

71 

70 

92 

.499 

91 

90 

88 

87 

86 

85 

83 

82 

81 

79 

78 

77   75 

74 

72 

71 

93 

.546 

92 

91 

89 

88 

87 

86 

84 

83 

82 

81 

79 

78 

76 

75 

74 

72 

94 

.595 

93 

92 

90 

89 

88 

87 

85 

84 

83 

82 

80 

79 

78 

76 

75 

73 

95 

1.645 

94 

93 

91 

90 

89 

88 

87 

85 

84 

83 

81 

80  (  79 

77 

76 

74 

96 

.696 

95 

94 

92 

91 

90 

89 

88 

86 

85 

84 

82 

81 

80 

78 

77    76 

97 

.749 

96 

95 

93. 

92 

91 

90 

89 

87 

86 

85 

83 

82 

81 

79 

>8    77 

98 

.803 

97 

96 

94 

93 

92 

91 

90 

88 

87 

86 

85 

83 

82 

81 

79    78 

99 

.859 

98 

97 

95 

94 

93 

92 

91 

89 

88 

87 

86   84 

83 

82 

80    79 

100 

1.916 

99 

98 

96 

95 

94 

93 

92 

90 

89 

88 

87   85 

84 

83 

81    80 

101 

1.975 

100 

99 

98 

96 

95 

94 

93 

92 

90 

89 

88   86 

85 

84 

83    81 

102 

2.035 

101 

100 

99 

97 

96 

95 

94 

93 

91 

90 

89   88 

86 

85 

84    82 

103 

.097 

102 

101 

100 

98 

97 

96 

95 

94 

92 

91 

90   89 

87 

86 

85    83 

104 

.160 

103 

102 

101 

99 

98 

97 

96 

95 

93 

92 

91   90 

88 

87 

86    85 

105 

2.225 

104 

103 

102 

100 

99 

98 

97 

96 

94 

93 

92   91 

89 

88 

87 

86 

106 

.292 

105 

104 

103 

101 

100 

99 

98 

97 

95 

94 

93   92 

91 

89 

88 

87 

107 

.360 

106 

105 

104 

102 

101 

100 

99 

98 

97 

95 

94   93 

92 

90 

89 

88 

108 

.431 

107 

106 

105 

103 

102 

101 

100 

99 

98 

96 

95   94 

93 

91 

90 

89 

109 

.503 

108 

107 

106 

104 

103 

102 

101 

100 

99 

97 

96   95 

94 

92 

91 

90 

110 

2.576 

109 

108 

107 

105 

104 

103 

102 

101 

100 

98 

97   96 

95 

94 

92 

91 

111 

.652 

110 

109 

108 

106 

105 

104 

103 

102 

101 

99 

98   97 

96 

95 

93 

92 

112 

.730 

111 

110 

109 

108 

106 

105 

104 

103 

102 

101 

99  !  98 

97 

96 

94 

93 

113 

.810 

112 

111 

110 

109 

107 

106 

105 

104 

103 

102 

100 

99 

98 

97 

96 

94 

114 

.891 

113 

112 

111 

110 

108 

107 

106 

106 

104 

103 

101 

100 

99 

98 

97 

95 

115 

2.975 

114 

113 

112 

111 

109 

108 

107 

106 

105 

104 

in-j  Kil 

100 

99 

98 

96 

116 

3.061 

115 

114 

113 

112 

110 

109 

108 

107 

106 

105 

103  !  102 

101 

100 

99    97 

117 

.148 

116 

115 

114 

113 

111 

110 

109 

108 

107 

106 

105 

103 

102 

101 

ICO    99 

118 

.239 

117 

116 

115 

114 

112 

111 

110 

109 

108 

107 

106 

104 

103 

102 

101   100 

119 

.331 

118 

117 

116 

115 

113 

112 

111 

110 

109 

108 

107 

105 

104 

103 

102   101 

120 

3.425 

119 

118 

117 

116 

114 

113 

112 

111 

110 

109 

108 

106 

105 

104 

103   102 

121 

.522 

120 

119 

118 

117 

115 

114 

113 

112 

111 

110 

109 

108 

106 

105 

104   103 

122 

.621 

121 

120 

119 

118 

116 

115 

114 

113 

112 

111 

110 

109 

107 

106 

105   104 

123 

.723 

122 

121 

120 

119 

118 

116 

115 

114 

113 

112 

111 

110 

108 

107 

106 

105 

124 

.827 

123 

122 

121 

120 

119 

117 

116 

115 

114 

113 

112 

111 

109 

108 

107 

106 

125 

3.933 

124 

123 

122 

121 

120 

118 

117 

116 

115 

114 

113 

112 

111 

109 

108 

107 

126 

4.  042 

125 

124 

123 

122 

121 

119 

118 

117 

116 

115 

114 

118 

112  110 

109 

108 

127 

.154 

126 

125 

124 

123 

122 

120 

119 

118 

117 

116 

115 

114 

113 

111 

110 

109 

128 

.268 

127 

126 

125 

124 

123 

121 

120 

119 

118 

117 

116 

115 

114 

112 

111 

110 

129 

.385 

128 

127 

126 

125 

124 

122 

121 

120 

119 

118 

117 

116 

115 

114 

112 

111 

130 

4.504 

129 

128 

127 

126 

125 

123 

122 

121 

120 

119 

118 

117 

116 

115 

113 

112 

131 

.627 

130 

129 

128 

127 

126 

124 

123 

122 

121 

120 

119 

118 

117 

116 

114 

113 

132 

.752 

131 

130 

129 

128 

127 

126 

124 

123 

122 

121 

120 

119 

118 

117 

115 

114 

133 

4.880 

132 

131 

130 

129 

128 

127 

125 

124 

123 

122 

121 

120 

119 

118 

117 

115 

134 

5.011 

133 

132 

131 

130 

129 

128 

126 

125 

124 

123 

122 

121 

120 

119 

118 

116 

135 

5.145 

134 

133 

132 

131 

130 

129 

127 

126 

125 

124 

123 

122 

121 

120 

119 

117 

136 

.282 

135 

134 

133 

132 

131 

130 

128 

127 

126 

125 

124 

123 

122 

121 

120 

118 

137 

.422 

136 

135 

134 

133 

132 

131 

129 

128 

127 

126 

125 

124 

123 

122 

121 

120 

138 

.565 

137 

136 

135 

134 

133 

132 

130 

129 

128 

127 

126 

125 

124 

123 

122 

121 

139 

.712 

138 

137 

136 

135 

134 

133 

132 

130 

129 

128 

127 

126 

125 

124 

123 

122 

140 

5.862 

139 

138 

137 

136 

135 

134 

133 

131 

130 

129 

128 

127 

126 

125 

124 

123 

DEW-POINT. 

55 

TABLE  V. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  23.0  inches. 


Air 

Vapor 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

leinp. 

t 

pr68Si 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

80 

1.022 

55 

53 

51 

49 

47 

44 

42 

40 

37 

34 

31 

28 

24 

20 

15 

9 

81 

.056 

56 

54 

52 

50 

48 

46 

44 

41 

39 

36 

33 

30 

27 

23 

18 

13 

82 

.091 

57 

56 

54 

52 

50 

47 

45 

43 

40 

38 

35 

32 

29 

25 

21 

16 

83 

.127 

59 

57 

55 

53 

51 

49 

47 

44 

42 

40 

37 

34 

31 

27 

24 

19 

84 

.!« 

60 

58 

56 

54 

52 

50 

48 

46 

44 

41 

39 

36 

32 

29 

26 

22 

85 

1.201 

61 

59 

58 

56 

54 

52 

50 

48 

45 

43 

40 

38 

35 

31 

28 

25 

86 

.241 

62 

61 

59 

57 

55 

58 

51 

49 

47 

45 

42 

40 

37 

34 

30 

27 

87 

.281 

64 

62 

60 

58 

57 

55 

53 

51 

48 

46 

44 

41 

39 

36 

32 

29 

88 

.322 

65 

63 

61 

60 

58 

56 

54 

52 

50 

48 

46 

43 

40 

38 

35 

31 

89 

.364 

66 

64 

63 

61 

59 

57 

55 

54 

52 

49 

47 

45 

42 

39 

37 

33 

90 

1.408 

67 

66 

64 

62 

GO 

59 

57 

55 

53 

51 

49 

46 

44 

41 

38 

35 

91 

.453 

68 

67 

65 

63 

62 

60 

58 

56 

54 

52 

50 

48 

46 

43 

40 

37 

92 

.499 

69 

68 

66 

65 

63 

61 

59 

58 

56 

54 

52 

50 

47 

45 

42 

39 

93 

.546 

71 

69 

68 

66 

64 

63 

61 

59 

57 

55 

53 

51 

49 

46 

44 

42 

94 

.595 

72 

70 

69 

67 

66 

64 

62 

60 

59 

57 

55 

53 

50 

48 

46 

43 

95 

1.645 

73 

72 

70 

68 

67 

65 

63 

62 

60 

58 

f>6 

54 

52 

50 

48 

45 

96 

.696 

74 

73 

71 

70 

68 

66 

65 

63 

61 

60 

58 

56 

54 

51 

49 

47 

97 

.749 

75 

74 

72 

71 

69 

68 

66 

64 

63 

61 

59 

57 

55 

53 

51 

48 

98 

.803 

76 

75 

74 

72 

70 

69 

67 

66 

64 

62 

60 

58 

56 

54 

52 

50 

99 

.859 

78 

76 

75 

73 

72 

70 

69 

67 

65 

64 

62 

60 

58 

56 

54 

52 

100 

1.916 

79 

77 

76 

74 

73 

71 

70 

68 

67 

65 

63 

61 

59 

58 

56 

53 

101 

1.975 

80 

78 

77 

76 

74 

73 

71 

69 

68 

66 

64 

63 

61 

59 

57 

55 

102 

2.035 

81 

80 

78 

77 

75 

74 

72 

71 

69 

67 

66 

64 

62 

60 

58 

56 

103 

.097 

82 

81 

79 

78 

76 

75 

73 

72 

70 

69 

67 

65 

64 

62 

60 

58 

104 

.160 

83 

82 

80 

79 

78 

76 

75 

73 

72 

70 

68 

67 

65 

63 

61 

59 

105 

2.225 

84 

83 

82 

80 

79 

77 

76 

74 

73 

71 

70 

68 

66 

64 

63 

61 

106 

.292 

85 

84 

83 

81 

80 

78 

77 

76 

74 

72 

71 

69 

68 

66 

64 

62 

107 

.360 

86 

85 

84 

82 

81 

80 

78 

77 

75 

74 

72 

71 

69 

67 

66 

64 

108 

.431 

88 

86 

85 

84 

82 

81 

79 

78 

76 

75 

73 

72 

70 

69 

67 

65 

109 

.503 

89 

87 

86 

85 

83 

82 

81 

79 

78 

76 

75 

73 

72 

70 

68 

66 

110 

2.576 

90 

88 

87 

8G 

84 

83 

82 

80 

79 

77 

76 

74 

73 

71 

69 

68 

111 

.652 

91 

90 

88 

87 

86 

84 

83 

81 

80 

79 

77 

76 

74 

72 

71 

69 

112 

.730 

92 

91 

89 

88 

87 

85 

84 

83 

81 

80 

78 

77 

75 

74 

72 

70 

113 

.810 

93 

92 

90 

89 

88 

87 

85 

84 

82 

81 

80 

78 

76 

75 

73 

72 

114 

.891 

94 

93 

92 

90 

89 

88 

80 

85 

84 

82 

81 

79 

78 

76 

75 

73 

115 

2.975 

95 

94 

93 

91 

90 

89 

87 

86 

85 

83 

82 

80 

79 

77 

76 

74 

116 

3.061 

96 

95 

94 

92 

91 

90 

89 

87 

86 

84 

83 

82 

80 

79 

77 

76 

117 

.148 

97 

96 

95 

94 

92 

91 

90 

88 

87 

86 

84 

83 

81 

80 

78 

77 

118 

.239 

98 

97 

96 

95 

93 

92 

91 

89 

88 

87 

85 

84 

83 

81 

80 

78 

119 

.331 

99 

98 

97 

96 

94 

93 

92 

91 

89 

88 

87 

85 

84 

82 

81 

79 

120 

3.425 

101 

99 

98 

97 

96 

94 

93 

92 

90 

89 

88 

86 

85 

84 

82 

81 

121 

.522 

102 

100 

99 

98 

97 

95 

94 

93 

92 

90 

89 

88 

86 

85 

83 

82 

122 

.621 

103 

101 

100 

99 

98 

96 

95 

94 

93 

91 

90 

89 

87 

86 

84 

83 

123 

.723 

104 

102 

101 

100 

99 

98 

96 

95 

94 

92 

91 

90 

88 

87 

80 

84 

124 

.827 

105 

104 

102 

101 

100 

99 

97 

96 

95 

94 

92 

91 

90 

88 

87 

85 

125 

3.933 

106 

105 

103 

102 

101 

100 

99 

97 

96 

95 

93 

92 

91 

89 

88 

87 

126 

4.042 

107 

106 

104 

103 

102 

101 

100 

98 

97 

96 

95 

93 

92 

91 

89 

88 

127 

.154 

108 

107 

106 

104 

103 

102 

101 

99 

98 

97 

96 

94 

93 

92 

90 

89 

128 

.268 

109 

108 

107 

105 

104 

103 

102 

101 

99 

98 

97 

95 

94 

93 

92 

90 

129 

.385 

110 

109 

108 

106 

105 

104 

103 

102 

100 

99 

98 

97 

95 

94 

93 

91 

130 

4.504 

111 

110 

109 

108 

106 

105 

104 

103 

101 

100 

99 

98 

96 

95 

94 

02 

131 

.627 

112 

111 

110 

109 

107 

106 

105 

104 

103 

101 

100 

99 

98 

96 

95 

94 

132 

.752 

113 

112 

111 

110 

108 

107 

106 

105 

104 

102 

101 

100 

99 

97 

96 

95 

133 

4.880 

114 

113 

112 

111 

110 

108 

107 

106 

105 

104 

102 

101 

100 

99 

97 

96 

134 

5.011 

115 

114 

113 

112 

111 

109 

108 

107 

106 

105 

103 

102 

101 

100 

98 

97 

135 

5.145 

116 

115 

114 

113 

112 

111 

109 

108 

107 

106 

104 

103 

102 

101 

99 

98 

136 

.282 

117 

116 

115 

114 

113 

112 

110 

109 

108 

107 

106 

104 

103 

102 

101 

99 

137 

.422 

118 

117 

116 

115 

114 

113 

111 

110 

109 

108 

107 

105 

104 

103 

102 

100 

138 

.565 

119 

118 

117 

116 

115 

114 

112 

111 

110 

109 

108 

107 

105 

104 

103 

102 

139 

.712 

120 

119 

118 

117 

116 

115 

114 

112 

111 

110 

109 

108 

106 

105 

104 

103 

140 

5.862 

121 

120 

119 

118 

117 

116 

115 

113 

112 

111 

110 

109 

108 

106 

105 

104 

56 


TABLE  V. — Temperature  of  dew-point  in  degrees  Fahrenheit. 

Pressure  =  23.0  inches. 


Air 
iemp. 

t 

Vapor 
press, 
e 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42    43 

44 

45 

46 

47 

48 

80 
81 

1.022 
.056 

1 

6 

-11 
-  3 

-21 

(t-f) 

82 
83 

.091 
.127 

11 
14 

-f  3 
8 

—  9 
-  1 

—  41 
-17 

t 

49 

50 

51 

62 

53 

QA 

163 

18 

12 

4-  5 

g 

30 

OTC 

-j~  *> 

104 

-20 

85 

1.201 

21 

16 

g 

+  1 

-13 

105 

—  6 

—40 

86 

.241 

23 

19 

13 

6 

-  4 

-23 

106 

+  3 

—12 

87 

.281 

26 

22 

17 

11 

+  3 

-10 

-54 

107 

9 

—  1 

—23 

88 

.322 

28 

24 

20 

15 

8 

-  1 

-18 

108 

14 

+  6 

—  6 

—49 

89 

.364 

30 

27 

23 

18 

12 

+  5 

—  7 

-34 

109 

19 

12 

+  3 

-14 

110 

22 

17 

9 

—  2 

—25 

90 

1.408 

32 

29 

25 

21 

16 

10 

+  1 

-14 

91 

.453 

34 

31 

28 

24 

20 

14 

7 

-  3 

-25 

92 

.499 

36 

33 

30 

27 

23 

18 

11 

+  3 

—  9 

—59 

98 

.546 

39 

36 

32 

29 

25 

21 

15 

9 

-  1 

—17 

94 

.595 

41 

38 

35 

31 

28 

24 

19 

13 

+  6 

—  5 

—32 

95 

1.645 

42 

40 

37 

33 

30 

26 

22 

17 

n 

+  2 

—12 

96 

.696 

44 

42 

39 

36 

32 

29 

25 

20 

15 

8 

-  2 

—22 

97 

.749 

46 

44 

41 

38 

34 

31 

28 

23 

19 

13 

+  5 

—  7 

—41 

98 

.803 

48 

45 

43 

40 

37 

33 

30 

26 

22 

17 

10 

+  1 

—15 

99 

.859 

50 

47 

45 

42 

39 

36 

32 

29 

25 

21 

14 

7 

—  3 

—28 

100 

1.916 

51 

49 

46 

44 

41 

38 

35 

31 

28 

24 

19 

12 

+  4 

g 

101 

1.975 

53 

51 

48 

46 

43 

40 

37 

34 

30 

26 

22 

17 

10 

±  o 

—18 

102 

2.035 

54 

52 

50 

48 

45 

42 

39 

36 

32 

29 

25 

20 

14 

+  7 

—  5 

—32 

103 

.097 

56 

54 

52 

49 

47 

44 

41 

38 

35 

31 

28 

23 

18 

12 

+  3 

—11 

104 

.160 

57 

55 

53 

51 

49 

46 

43 

40 

37 

34 

30 

26 

22 

16 

9 

—  1 

105 

2.225 

59 

57 

55 

53 

50 

48 

45 

42 

39 

36 

33 

29 

25 

20 

14 

+  6 

106 

.292 

60 

58 

56 

54 

52 

50 

47 

44 

42 

39 

35 

32 

28 

24 

18 

12 

107 

.360 

62 

60 

58 

56 

54 

51 

49 

46 

44 

41 

38 

34 

31 

27 

22 

16 

108 

.431 

63 

61 

59 

57 

55 

53 

51 

48 

46 

43 

40 

37 

33 

29 

25 

20 

109 

.503 

65 

63 

61 

59 

57 

55 

53 

50 

48 

45 

42 

39 

36 

32 

28 

24 

110 

2.576 

66 

64 

62 

60 

58 

56 

54 

52 

50 

47 

44 

41 

38 

34 

31 

27 

111 

.652 

67 

66 

64 

62 

60 

58 

56 

54 

51 

49 

46 

43 

40 

37 

33 

30 

112 

.730 

69 

67 

65 

63 

62 

60 

57 

55 

53 

51 

48 

46 

43 

40 

36 

32 

113 

.810 

70 

68 

67 

65 

63 

61 

59 

57 

55 

52 

50 

48 

45 

42 

38 

35 

114 

.891 

71 

70 

68 

66 

64 

63 

61 

59 

56 

54 

52 

49 

47 

44 

41 

38 

115 

2.  975 

73 

71 

69 

68 

G6 

64 

62 

60 

58 

56 

54 

51 

49 

46 

43 

40 

116 

3.061 

74 

72 

71 

69 

67 

66 

64 

62 

60 

58 

55 

53 

50 

48 

45 

42 

117 

.148 

75 

74 

72 

70 

69 

67 

65 

63 

61 

59 

57 

55 

52 

60 

47 

44 

118 

.239 

77 

75 

73 

72 

70 

68 

67 

65 

63 

61 

59 

57 

54 

52 

49 

47 

119 

.331 

78 

76 

75 

73 

71 

70 

68 

66 

64 

62 

60 

58 

56 

54 

51 

49 

120 

3.425 

79 

78 

76 

74 

73 

71 

69 

68 

66 

64 

62 

60 

58 

55 

53 

50 

121 

.522 

80 

79 

77 

76 

74 

72 

71 

69 

67 

65 

63 

61 

59 

57 

55 

52 

122 

.621 

82 

80 

79 

77 

75 

74 

72 

70 

69 

67 

65 

63 

61 

59 

57 

54 

123 

.723 

83 

81 

80 

78 

77 

75 

74 

72 

70 

68 

66 

64 

63 

61 

58 

66 

124 

.827 

84 

83 

81 

80 

78 

76 

75 

73 

72 

70 

68 

66 

64 

62 

60 

58 

125 

3.933 

85 

84 

82 

81 

79 

78 

76 

74 

73 

71 

69 

68 

66 

64 

62 

60 

126 

4.  042 

86 

85 

84 

82 

81 

79 

78 

76 

74 

72 

71 

69 

67 

65 

63 

61 

127 

.154 

88 

86 

85 

83 

82 

80 

79 

77 

76 

74 

72 

70 

69 

67 

65 

63 

128 

.268 

89 

87 

86 

85 

83 

82 

80 

78 

77 

75 

74 

72 

70 

68 

66 

64 

129 

.385 

90 

89 

87 

86 

84 

83 

81 

80 

78 

77 

75 

73 

72 

70 

68 

66 

130 

4.504 

91 

90 

88 

87 

86 

84 

83 

81 

80 

78 

76 

75 

73 

71 

69 

68 

131 

.627 

92 

91 

90 

88 

87 

85 

84 

82 

81 

79 

78 

76 

74 

72 

71 

69 

132 

.752 

93 

92 

91 

89 

88 

87 

85 

84 

82 

81 

79 

77 

76 

74 

72 

70 

133 

4.880 

95 

93 

92 

91 

89 

88 

86 

85 

83 

82 

80 

79 

77 

75 

74 

72 

134 

5.011 

96 

94 

93 

92 

90 

89 

88 

86 

85 

83 

82 

80 

78 

77 

75 

73 

135 

.145 

97 

96 

94 

93 

92 

90 

89 

87 

86 

84 

83 

81 

80 

78 

76 

75 

136 

.282 

98 

97 

95 

94 

93 

91 

90 

89 

87 

8(i 

84 

83 

81 

80 

78 

76 

137 

.422 

99 

98 

97 

95 

94 

93 

91 

90 

88 

87 

85 

84 

82 

81 

79 

78 

138 

.565 

100 

99 

98 

96 

95 

94 

92 

91 

90 

88 

87 

85 

84 

82 

81 

79 

139 

.712 

101 

100 

99 

98 

96 

95 

94 

92 

91 

89 

88 

86 

85 

83 

82 

80 

140 

6.862 

103 

101 

100 

99 

97 

96 

95 

93 

92 

91 

89 

88 

86 

85 

83 

81 

57 


TABLE  VI. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 


Pressure  =  30.0  inches. 


Air 
em  p. 
t 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

.2 

.4 

.6 

.8 

1.0 

1.2 

1.4 

1.6 

1.8 

2.0  2.2 

2.4 

2.6 

2.8 

3.0   3.2 

3.4 

3.6 

3.8 

4.0 

—  40 
—39 

46 

48 

/ 

(t-f) 

—  38 
—37 

50 
53 

6 

t 

4.2 

4.4 

4.6 

4.8 

5.0 

5.2 

5.4 

5.6 

5.8 

6.0 

—36 

56 

10 





—  — 

















—35 

59 

15 

8 
y 

1 
5 

i 

—34 

61 

20 

—33 

63 

24 

10 

9 

5 

0 

—32 

64 

28 

11 

12 

8 

4 

0 

—31 

66 

32 

0 

12 

16 

12 

8 

4 

0 

13 

19 

15 

11 

7 

4 

0 

—30 

68 

36 

4 

14 

22 

18 

15 

11 

8 

4 

0 

—29 

70 

41 

9 

15 

25 

21 

18 

14 

11 

7 

4 

0 

—28 

72 

45 

15 

16 

28 

24 

21 

18 

14 

11 

8 

4 

1 

—27 

74 

48 

19 

17 

30 

27 

24 

21 

17 

14 

11 

8 

5 

1 

—26 

75 

51 

24 

0 

18 

33 

30 

27 

24 

20 

17 

14 

11 

8 

5 

19 

35 

32 

29 

26 

23 

20 

17 

14 

11 

8 

—25 

76 

53 

29 

5 

20 

37 

34 

32 

29 

26 

23 

20 

17 

14 

12 

-23 

77 
78 

55 
57 

32 
36 

10 
15 

(<-<') 

oo 

80 

59 

39 

20 

o 

J 

—21 

81 

61 

43 

24 

5 

I 

0.1 

0.2 

0.3 

0.4 

0.5 

—20 
—19 
—18 
—17 
—16 

82 
83 
84 
85 
86 

63 
65 
67 
69 
70 

45 
48 
51 
53 
56 

28 
32 
35 
39 
42 

10 
15 
19 
23 
27 

2 
7 
12 

-50 
—49 
-48 
-47 
-46 

50 
54 
57 
60 
63 

5 
12 
17 

22 

—15 

86 

72 

58 

45 

31 

^7 

4 

—45 

66 

28 

—14 

87 

74 

61 

48 

34 

21 

8 

—44 

68 

32 

—13 

88 

75 

63 

50 

38 

25 

13 

0 

—43 

70 

36 

3 

—12 

88 

76 

64 

52 

41 

29 

17 

6 

—42 

71 

40 

9 

—11 

89- 

77 

66 

55 

44 

32 

21 

10 

—41 

72 

43 

14 

-40 

73 

46 

18 

—10 

90 

78 

68 

57 

46 

36 

25 

14 

4 

-39 

74 

48 

22 

—  9 

90 

79 

70 

59 

49 

39 

•29 

18 

,) 

-38 

75 

50 

25 

2 

0 

90 

81 

71 

61 

51 

42 

32 

22 

18 

3 

—37 

76 

53 

28 

6 

—  7 

91 

82 

72 

63 

54 

44 

35 

26 

17 

8 

—36 

77 

56 

33 

10 

—  6 

91 

82 

73 

64 

56 

47 

38 

29 

20 

12 

3 

-35 

78 

59 

37 

15 

-34 

80 

61 

41 

20 

0 

—  5 

91 

83 

75 

66 

58 

49 

41 

32 

24 

16 

7 

—33 

81 

63 

44 

24 

5 

—  4 

92 

84 

76 

68 

60 

£2 

44 

36 

28 

20 

12 

4 

-32 

82 

64 

46 

28 

10 

—  3 

92 

85 

77 

69 

6t 

54 

46 

39 

31 

23 

16 

8 

1 

—31 

83 

66 

49 

32 

15 

—  2 

1 

92 
93 

85 
86 

78 
79 

71 

72 

63 
65 

56 
58 

49 
51 

42 
44 

34 
37 

27 
30 

1!) 
23 

16 

5 
10 

3 

-30 

84 

68 

52 

36 

20 

0 

93 

87 

80 

73 

67 

60 

53 

47 

40 

33 

27 

20 

14 

7 

1 

-f  1 

93 

87 

81 

75 

68 

62 

56 

49 

43 

36 

30 

24 

18 

11 

5 

2 

94 

88 

82 

70 

70 

64 

58 

52 

46 

39 

33 

27 

21 

15 

9 

3 

3 

94 

88 

82 

77 

71 

G5 

59 

54 

48 

42 

36 

30 

25 

19 

13 

7 

2 

4 

94 

89 

83 

78 

72 

66 

61 

55 

50 

44 

39 

33 

28 

22 

17 

11 

6 

0 

5 

95 

89 

84 

78 

73 

68 

63 

57 

52 

46 

41 

36 

31 

25 

20 

15 

10 

4 

6 

95 

90 

84 

79 

74 

69 

64 

59 

54 

49 

43 

38 

33 

28 

23 

18 

13 

8 

3 

7 

95 

90 

85 

80 

75 

70 

65 

60 

55 

51 

46 

41 

36 

31 

26 

21 

17 

12 

7 

2 

8 

95 

90 

86 

81 

76 

71 

67 

62 

57 

53 

48 

43 

38 

34 

29 

24 

20 

15 

11 

6 

9 

95 

91 

86 

82 

77 

72 

.68 

63 

59 

55 

50 

46 

41 

36 

32 

27 

23 

18 

14» 

10 

10 

96 

91 

87 

82 

78 

73 

69 

65 

60 

56 

52 

47 

43 

39 

34 

30 

26 

22 

17 

13 

11 

96 

91 

87 

83 

79 

74 

70 

66 

62 

58 

53 

49 

45 

41 

37 

33 

28 

25 

20 

16 

12 

96 

92 

88 

84 

80 

75 

71 

67 

63 

59 

55 

51 

47 

43 

39 

35 

31 

27 

23 

19 

13 

96 

92 

88 

84 

80 

76 

73 

69 

65 

61 

57 

53 

49 

45 

41 

38 

34 

30 

26 

23 

14 

96 

92 

89 

85 

81 

77 

74 

70 

66 

62 

59 

55 

51 

48 

44 

40 

37 

33 

29 

26 

15 

96 

93 

89 

86 

'82 

78 

75 

71 

67 

64 

60 

57 

53 

50 

46 

42 

39 

35 

32 

29 

16 

96 

93 

90 

86 

82 

79 

76 

72 

69 

65 

62 

58 

55 

'51 

48 

45 

41 

38 

34 

31 

17 

97 

93 

90 

86 

83 

80 

77 

73 

70 

66 

63 

60 

57 

53 

50 

47 

43 

40 

37 

34 

18 

97 

93 

90 

87 

84 

80 

77 

74 

71 

68 

65 

61 

58 

55 

52 

49 

45 

42 

39 

36 

19 

97 

94 

90 

87 

84 

81 

78 

75 

'(2 

69 

66 

63 

60 

56 

53 

50 

47 

44 

41 

38 

20 

97 

94 

91 

88 

£5 

82 

79 

76 

73 

70 

67 

64 

61 

58 

55 

52 

49 

46 

43 

40 

58 


TABLE  VI.— Relative  humidity,  per  cent— Fahrenheit  temperatures. 


Pressure  =  3<>.  0  inches. 


Air 
temp. 
t 

Depression  of  wet-bulb  thermometer  (t—  t'). 

0.5 

.0 

.5 

2.0 

2.5 

.0 

3.5 

4.0 

4.5 

5.0 

.5 

6.0 

0.5 

7.0 

7.5 

.0 

8.5 

9.0 

9.6 

to.o 

10.5 

20 

92 

85 

77 

70 

62 

55 

48 

40 

33 

26 

19 

12 

5 

21 

92 

85 

78 

71 

63 

56 

49 

42 

35 

28 

21 

15 

8 

1 

22 

93 

86 

78 

71 

65 

58 

51 

44 

37 

31 

24 

17 

11 

4 

23 

93 

86 

79 

72 

66 

59 

52 

46 

39 

33 

26 

'20 

14 

7 

1 

24 

93 

87 

80 

73 

67 

60 

54 

47 

41 

35 

29 

•2'2 

16 

10 

4 

25 

94 

87 

81 

74 

68 

62 

55 

49 

43 

37 

31 

25 

19 

13 

7 

1 

26 

94 

87 

81 

75 

69 

63 

67 

51 

45 

39 

43 

27 

21 

16 

10 

4 

27 

94 

88 

82 

76 

70 

64 

58 

52 

47 

41 

35 

29 

24 

18 

13 

7 

2 

28 

94 

88 

82 

76 

71 

65 

59 

54 

48 

43 

37 

32 

20 

21 

15 

10 

5 

29 

94 

88 

83 

77 

72 

66 

60 

55 

50 

44 

39 

34 

28 

23 

18 

13 

8 

3 

30 

94 

89 

83 

78 

73 

67 

62 

56 

51 

46 

41 

36 

31 

26 

21 

16 

11 

6 

1 

31 

94- 

89 

84 

78 

73 

68 

63 

58 

52 

47 

42 

37 

83 

28 

23 

18 

13 

8 

4 

-  32 

95 

89 

84 

79 

74 

69 

64 

59 

54 

49 

44 

39 

35 

30 

25 

20 

16 

11 

7 

2 

33 

95 

90 

85 

80 

75 

70 

65 

60 

56 

51 

46 

41 

37 

32 

27 

23 

18 

14 

9 

5 

0 

34 

95 

90 

86 

81 

76 

71 

66 

62 

57 

52 

48 

43 

38 

34 

29 

25 

21 

16 

12 

8 

3 

35 

95 

91 

86 

81 

77 

72 

67 

63 

58 

54 

49 

45 

40 

36 

32 

27 

23 

19 

14 

10 

6 

36 

95 

91 

86 

82 

77 

73 

68 

64 

60 

55 

51 

46 

42 

:58 

34 

29 

25 

21 

17   13 

9 

37 

95 

91 

87 

83 

78 

74 

69 

65 

61 

57 

53 

48 

44 

40 

36 

31 

27 

23 

19 

15 

11 

38 

96 

91 

87 

83 

75 

75 

70 

66 

62 

58 

54 

50 

46 

42 

37 

33 

29 

25 

21 

17 

14 

39 

96 

92 

87 

83 

79 

75 

71 

67 

63 

59 

55 

51 

47 

43 

39 

35 

31 

27 

24 

20 

16 

-40 

96 

92 

87 

83 

79 

75 

71 

68 

64 

60 

56 

52 

48 

45 

41 

37 

33 

29 

26 

22 

18 

41 

96 

92 

88 

84 

80 

76 

72 

09 

65 

61 

57 

54 

50 

46 

42 

39 

35 

31 

28   '24 

20 

42 

96 

92 

88 

85 

81 

77 

73 

69 

65 

62 

58 

55 

51 

47 

44 

40 

36 

33 

30 

26 

23 

43 

96 

88 

85 

81 

77 

73 

70 

66 

63 

59 

55 

52 

48 

45 

42 

38 

35 

81 

28 

25 

44 

96 

93" 

89 

85 

81 

78 

74 

71 

67 

63 

60 

56 

53 

49 

46 

43 

39 

36 

33 

30 

26 

45 

96 

93 

89 

86 

8? 

7« 

74 

71 

67 

64 

61 

57 

54 

51 

47 

44 

41 

38 

34 

31 

28 

46 

96 

93 

89 

86 

82 

79 

75 

72 

68 

65 

61 

58 

55 

52 

48 

45 

42 

39 

35 

32 

29 

47 

96 

93 

89 

86. 

82 

79 

75 

72 

69 

66 

62 

59 

56 

68 

49 

46 

43 

40 

37 

34 

31 

48 

96 

93 

90 

86 

83 

79 

70 

73 

69 

66 

63 

60 

57 

54 

50 

47 

44 

41 

38 

35 

32 

49 

96 

93 

90 

86 

83 

80 

76 

73 

70 

67 

64 

61 

57 

54 

51 

48 

45 

42 

39 

36 

34 

60 

96 

93 

90 

87 

F3 

80 

77 

74 

71 

67 

64 

61 

58 

55 

52 

49 

46 

43 

41 

38 

35 

61 

97 

94 

90 

87   84 

81 

78 

75 

71 

68 

65 

62 

59 

u 

515 

50 

47 

45 

42 

39 

36 

62 

97 

94 

90 

87  j  81 

81 

78 

75 

72 

69 

66 

63 

GO 

67 

54 

51 

49 

46 

43 

40 

37 

63 

97 

94 

90 

87 

81 

81 

78 

75 

72 

69 

66 

63 

61 

58 

55 

52 

50 

47 

44 

41 

139 

64 

97 

94 

91 

88 

85 

82 

79 

76 

73 

70 

67 

64 

61 

59 

56 

53 

50 

48 

45 

42 

40 

65 

97 

94 

9t 

88 

85 

82 

79 

76 

73 

70 

68 

65 

62 

59 

57 

54 

51 

49 

46 

43 

41 

-  66 

97 

94 

91 

88 

85 

82 

79 

76 

73 

71 

68 

05 

68 

60 

57 

55 

52 

50 

47 

44 

42 

67 

97 

94 

91 

88 

85 

82 

80 

77 

74 

71 

69 

66 

63 

61 

58 

55 

63 

50 

48 

45 

43 

58 

97 

94 

91 

88 

85 

83 

80 

77 

7-t 

72 

09 

66 

64 

61 

59 

56 

54 

51 

49 

46 

44 

59 

97 

94 

91 

89 

86 

83 

80 

78 

75 

72 

70 

67 

65 

62 

59 

67 

55 

52 

49 

4/ 

45 

60 

97 

94 

91 

89 

86 

83 

81 

78 

75 

73 

70 

68 

65 

03 

60 

58 

55 

53 

50 

48 

46 

61 

97 

94 

92 

89 

86 

84 

81 

78 

76 

73 

71 

68 

65 

63 

61 

58 

50 

54 

51 

49 

47 

62 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

71 

69 

66 

64 

61 

59 

57 

54 

52 

50 

47 

63 

97 

95 

92 

89 

87 

84 

82 

79 

77 

74 

71 

69 

67 

04 

62 

60 

67 

55 

53 

50 

48 

-64 

97 

95 

92 

90 

87 

84 

82 

79 

77 

74 

72 

70 

07 

65 

63 

60 

58 

56 

53 

51 

49 

65 

97 

95 

92 

90 

87 

85 

82 

80 

77 

75 

72 

70 

68 

66 

63 

61 

59 

56 

54 

52 

50 

66 

97 

95 

92 

90 

87 

85 

82 

80 

78 

75 

73 

71 

68 

66 

04 

01 

59 

57 

55 

53 

51 

67 

97 

95 

92 

90 

87 

85 

83 

80 

78 

75 

73 

71 

69 

66 

64 

02 

60 

58 

56 

53 

51 

68 

97 

95 

92 

90 

88 

85 

83 

80 

78 

76 

74 

71 

69 

67 

65 

62 

60 

58 

56 

54 

52 

69 

97 

95 

93 

90 

88 

85 

83 

81 

79 

76 

74 

72 

70 

67 

65 

«3 

61 

59 

57 

55 

53 

70 

98 

95 

93 

90 

88 

86 

83 

81 

79 

77 

74 

72 

70 

68 

66 

64 

61 

59 

57 

55 

53 

71* 

98 

95 

93 

90 

88 

86 

84 

81 

79 

77 

75 

72 

70 

68 

6f 

04  62 

60 

58 

56 

64 

72 

98 

95 

93 

91 

88 

86 

84 

82 

79 

77 

75 

73 

71 

69 

67 

65 

63 

61 

59 

57 

55 

73 

98 

95 

93 

91 

88 

86 

84 

82 

80 

78 

75 

73 

71 

69 

67 

66 

63 

61 

59 

57 

55 

74 

98 

95 

93 

91 

89 

86 

84 

82 

80 

78 

70 

74 

71 

69 

67 

65 

63 

61 

60 

58 

56 

75 

9S 

96 

93 

91 

89 

86 

84 

82 

80 

78 

76 

71 

72 

70 

68 

06 

64 

62 

60 

58 

56 

76 

98 

9( 

93 

hi 

8'. 

87 

84 

82 

80 

78 

76 

74 

72 

70 

08 

66 

64 

62 

61 

5J 

57 

77 

98 

96 

93 

91 

85 

87 

85 

83 

81 

79 

77 

74 

72 

71 

69 

67 

65 

63 

61 

59 

57 

78 

98 

96 

9:5 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

63 

07 

65 

63 

62 

60 

58 

79 

<J8 

96 

93 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

68 

66 

64 

62 

60 

58 

89 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

75 

74 

72 

7( 

68 

66 

04 

62 

61 

59 

59 


TABLE  VI. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 


Pressure  =  30.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t—  t'). 

temp. 

I 

1 

i 

t 

11.0 

11.  fl 

12.0 

12.5 

13.0 

13.514.0 

14.5 

15.0 

15.5 

16.0 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

20.0 

20.5 

21.0 

35 

2 

36 

5 

1 

37 

7 

3 

38 

10 

6 

2 

39 

12 

8 

5 

1 

40 

15 

11 

7 

4 

0 

41 

17 

13 

10 

6 

3 

42 

19 

1C, 

12 

9 

5 

2 

43 

21 

18 

14 

11 

8 

4 

1 

44 

23 

20 

16 

13 

10 

7 

4 

0 

45 

25 

22 

18 

15 

12 

9 

6 

8 

46 

26 

23 

20 

17 

14 

11 

8 

5 

2 

47 

28 

26 

22 

19 

16 

13 

10 

7 

5 

2 

48 

29 

20 

23 

21 

18 

15 

12 

9 

7 

4 

1 

49 

31 

28 

25 

22 

19 

17 

14 

11 

9 

6 

3 

1 

50 

32 

29 

27 

24 

21 

18 

16 

13 

10 

8 

5 

3 

0 

51 

34 

31 

28 

26 

23 

20 

17 

15 

12 

9 

7 

4 

2 

52 

35 

32 

29 

27 

24 

22 

19 

17 

14 

11 

9 

6 

4 

1 

53 

36 

33 

31 

28 

26 

23 

20 

18 

16 

13 

10 

8 

6 

3 

1 

54 

37 

35 

32 

29 

27 

24 

22 

20 

17 

15 

12 

10 

8 

5 

3 

1 

55 

38 

M 

33 

31 

28 

26 

23 

21 

19 

16 

14 

12 

9 

7 

5 

2 

0 

56 

39 

37 

34 

32 

30 

27 

25 

22 

20 

18 

16 

13 

11 

9 

7 

4 

2 

57 

40 

38 

35 

33 

31 

28 

26 

24 

22 

19 

17 

15 

13 

10 

8 

6 

4 

2 

58 

41 

89 

37 

34 

32 

30 

27 

25 

23 

21 

18 

16 

14 

12 

10 

8 

6 

3 

1 

59 

42 

40 

38 

35 

33 

31 

29 

26 

24 

22 

20 

18 

16 

13 

11 

9 

7 

5 

3 

1 

60 

43 

41 

39 

37 

34 

32 

30 

28 

26 

23 

21 

19 

17 

15 

13 

11 

9 

7 

5 

3 

1 

61 

44 

42 

40 

38 

35 

33 

31 

29 

27 

25 

22 

20 

18 

16 

14 

12 

10 

8 

7 

5 

3 

62 

45 

43 

41 

39 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

14 

12 

10 

8 

6 

4 

63 

46 

44 

42 

40 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

17 

15 

13 

11 

10 

8 

6 

64 

47 

46 

43 

41 

38 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

17 

15 

13 

11 

9 

7 

65 

48 

40 

44 

41 

39 

37 

35 

33 

31 

29 

27 

25 

24 

22 

20 

18 

16 

14 

12 

11 

9 

66 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

29 

27 

25 

23 

21 

19 

17 

16 

14 

12 

10 

67 

49 

47 

45 

43 

41 

39 

37 

35 

33 

31 

30 

28 

26 

24 

22 

20 

19 

17 

15 

13 

12 

68 

50 

48 

46 

44 

42 

40 

38 

36 

34 

32 

31 

29 

27 

25 

23 

21 

20 

18 

16 

15 

13 

69 

51 

49 

•17 

45 

43 

41 

39 

37 

35 

33 

32 

30 

28 

26 

24 

23 

21 

19 

18 

16 

14 

70 

51 

49. 

48 

46 

44 

42 

40 

38 

30 

34 

33 

31 

29 

27 

25 

24 

22 

20 

19 

17 

15 

71 

52 

5(1 

48 

46 

45 

43 

41 

39 

37 

35 

33 

32 

30 

28 

27 

25 

23 

22 

20 

18 

17 

72 

53 

51 

49 

47 

45 

43 

42 

40 

38 

36 

34 

33 

31 

29 

28 

26 

24 

23 

21 

19 

18 

73 

53 

51 

50 

48 

46 

44 

42 

40 

39 

37 

35 

32 

30 

27 

25 

24 

22 

20 

19 

74 

54 

62 

50 

48 

47 

45 

43 

41 

39 

38 

36 

34 

33 

31 

29 

28 

26 

25 

23 

21 

20 

75 

54 

63 

51 

49 

47 

45 

44 

42 

40 

39 

37 

35 

34 

32 

30 

29 

27 

26 

24 

23 

21 

76 

55 

53 

51 

50 

48 

46 

44 

43 

41 

39 

38 

36 

34 

33 

31 

30 

28 

27 

25 

24 

22 

77 

56 

54 

52 

50 

48 

47 

45 

43 

42 

40 

39 

37 

35 

34 

32 

31 

29 

28 

26 

25 

23 

78 

56 

54 

53 

51 

49 

47 

46 

44 

43 

41 

39 

38 

36 

34 

33 

31 

30 

28 

27 

25 

24 

79 

57 

55 

53 

51 

50 

48 

46 

45 

43 

42 

40 

38 

37 

35 

34 

32 

31 

29 

28 

26 

25 

80 

57 

66 

51 

52 

50 

49 

47 

45 

44 

42 

41 

39 

38 

36 

35 

33 

32 

30 

29 

27 

26 

1 

i 

(1-0 

J1.5 

!2.0, 

2.5? 

,3.02 

3.5 

24.0 

24.  5  i 

,5.0  S 

5.55 

6.0 

26.5 

J7.0S 

7.55 

.8.  OS 

8.5 

61 

1 

62 

2 

1 

63 

4 

2 

0 

64 

6 

4 

2 

0 

65 

7 

5 

4 

2 

0 

66 

9 

7 

5 

3 

2 

0 

67 

10 

8 

7 

5 

3 

2 

68 

11 

10 

8 

6 

5 

3 

1 

69 

13 

11 

9 

8 

6 

5 

3 

1 

70 

14 

12 

11 

9 

8 

6 

4 

3 

1 

71 

15 

13 

12 

10 

9 

7 

6 

4 

3 

1 

72 

16 

15 

13 

12 

10 

9 

7 

6 

4 

3 

^ 

73 

17 

16 

14 

13 

11 

10 

8 

7 

5 

4 

3 

1 

74 

18 

17 

15 

14 

13 

11 

10 

8 

7 

6 

4 

3 

1 

75 

20 

18 

17 

15 

14 

12 

11 

9 

8 

7 

5 

4 

3 

1 

76 

'21 

19 

18 

16 

15 

13 

12 

11 

9 

8 

6 

5 

4 

3 

1 

77 

22 

20 

19 

17 

16 

14 

13 

12 

10 

9 

8 

6 

5 

4 

3 

78 

23 

21 

20 

18 

17 

10 

14 

13 

11 

10 

9 

8 

6 

5 

4 

79 

23 

22 

21 

19 

18 

17 

15 

14 

13 

11 

10 

9 

7 

6 

5 

80 

24 

23 

22 

20 

19 

18 

16 

15 

14 

12 

11 

10 

9 

7 

6 

60 


TABLE  VI.—  Relative  humidity,  per  cent— Fahrenheit  temperatures. 

Pressure  =  30. 0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (1  —  t'). 

temp. 
t 

1 

2 

1 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

80 

96 

91 

&7 

S3 

79 

75 

72 

68 

64 

61 

57 

54 

50 

47 

44 

82 

96 

92 

88 

84 

80 

76 

72 

69 

65 

61 

58 

65 

61 

48 

45 

84 

96 

92 

88 

84 

80 

76 

73 

69 

66 

62 

59 

56 

52 

49 

46 

86 

96 

92 

88 

84 

81 

77 

73 

70 

G6 

63 

60 

57 

53 

50 

47. 

-88 

36 

92 

88 

85 

81 

77 

74 

70 

6T 

64 

01 

57 

54 

51 

48 

90 

^6 

92 

89 

85 

81 

78 

74 

71 

68 

65 

61 

58 

65 

52 

49 

92 

96 

92 

89 

85 

82 

78 

75 

72 

68 

65 

62 

59 

56 

63 

50 

94 

96 

93 

89 

85 

82 

79 

75 

72 

69 

66 

63 

60 

57 

54 

51 

96 

96 

93 

89 

86 

82 

79 

76 

73 

69 

66 

63 

61 

58 

65 

52 

98 

96 

93 

89 

86 

83 

79 

76 

73 

70 

67 

64 

61 

58 

56 

53 

100 

96 

93 

89 

86 

83 

80 

77 

73 

70 

68 

65 

62 

59 

66 

54 

102 

96 

93 

90 

86 

83 

80 

77 

74 

71 

68 

65 

62 

60 

67 

55 

104 

97 

93 

90 

87 

83 

80 

77 

74 

71 

60 

66 

63 

60 

58 

55 

106 

97 

93 

90 

87 

84 

81 

78 

75 

72 

69 

66 

64 

61 

68 

56 

108 

97 

93 

90 

87 

84 

81 

78 

75 

72 

70 

67 

64 

62 

59 

57 

110 

97 

93 

90 

87 

84 

81 

78 

75 

73 

70 

67 

65 

62 

60 

57 

112 

97 

94 

90 

87 

84 

81 

79 

76 

73 

70 

68 

65 

63 

60 

58 

114 

97 

94 

91 

88 

85 

82 

79 

76 

74 

71 

68 

66 

63 

61 

58 

116 

97 

94 

91 

88 

85 

82 

79 

76 

74 

71 

69 

66 

64 

61 

59 

118 

97 

94 

91 

88 

85 

82 

79 

77 

74 

72 

69 

67 

64 

62 

69 

120 

97 

94 

9V 

88 

85 

82 

80 

77 

74 

72 

69 

67 

65 

62 

60 

122 

97 

94 

91 

88 

85 

83 

80 

77 

75 

72 

70 

67 

65 

63 

60 

124 

97 

94 

91 

88 

85 

83 

80 

78 

75 

73 

70 

68 

65 

63 

61 

126 

97 

94 

91 

88 

86 

83 

80 

78 

75 

73 

70 

68 

66 

64 

61 

128 

97 

94 

91 

89 

86 

83 

81 

78 

76 

73 

71 

68 

66 

64 

62 

130 

97 

94 

91 

8'J 

86 

83 

81 

78 

76 

73 

71 

69 

67 

64 

62 

132 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

71 

69 

67 

65 

63 

134 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

72 

69 

67 

65 

63 

136 

97 

94 

92 

89 

86 

84 

81 

79 

77 

74 

72 

70 

68 

65 

63 

138 

97 

94 

92 

89 

87 

84 

82 

79 

77 

75 

72 

70 

68 

66 

64 

140 

97 

95 

92 

89 

87 

84 

82 

79 

77 

75 

73 

70 

68 

66 

64 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

t 

16 

17 

18 

19 

20 

21 

22 

• 

23 

24 

25 

26 

27 

28 

29  1  30 

80 

41 

38 

35 

32 

29 

26 

23 

20 

18 

15 

12 

10 

7 

5 

3 

82 

42 

39 

36 

133 

30 

28 

25 

22 

.20 

17 

14 

12 

10 

7 

6 

84 

43 

40 

37 

35 

32 

29 

26 

24 

21 

19 

16 

14 

12 

9 

7 

86 

44 

42 

39 

36 

33 

31 

28 

26 

23 

21 

18 

16 

14 

11 

9 

88 

46 

43 

40 

37 

35 

32 

30 

27 

25 

22 

20 

18 

15 

13 

11 

90 

47 

44 

41 

39 

36 

34 

31 

29 

26 

24 

22 

19 

17 

15 

13 

92 

48 

45 

42 

40 

37 

35 

32 

30 

28 

25 

23 

21 

19 

17 

15 

94 

49 

46 

43 

41 

3K 

36 

33 

31 

29 

27 

24 

22 

20 

18 

16 

96 

50 

47 

44 

42 

39 

37 

35 

32 

30 

28 

26 

24 

22 

20 

18 

98 

50 

48 

45 

43 

40 

38 

36 

34 

32 

29 

27 

25 

23 

21 

19 

100 

61 

49 

46 

44 

41 

39 

37 

35 

33 

30 

28 

26 

24 

22 

21 

102 

52 

49 

47 

45 

42 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

104 

53 

50 

48 

46 

43 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

106 

53 

51 

49 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

24 

108 

54 

52 

49 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

27 

25 

110 

55 

52 

50 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

112 

55 

53 

51 

49 

47 

44 

42 

40 

38 

36 

35 

33 

31 

29 

27 

114 

56 

54 

52 

49 

47 

45 

43 

41 

39 

37 

35 

34 

32 

30 

28 

116 

57 

54 

52 

50 

48 

46 

44 

42 

40 

38 

36 

34 

33 

31 

29 

118 

57 

55 

53 

51 

49 

47 

45 

43 

41 

39 

37 

35 

34 

32 

30 

120 

58 

55 

53 

51 

49 

47 

45 

43 

41 

40 

38 

36 

34 

33 

31 

122 

58 

56 

54 

52 

50 

48 

46 

44 

42 

40 

39 

37 

35 

34 

32 

124 

59 

57 

64 

52 

50 

48 

47 

45 

43 

41 

39 

38 

36 

34 

33 

126 

59 

57 

55 

53 

51 

49 

47 

45 

44 

42 

40 

38 

37 

35 

33 

128 

60 

58 

56 

54 

52 

50 

48 

46 

44 

42 

41 

39 

37 

36 

34 

130 

60 

58 

56 

54 

52 

50 

48 

47 

45 

43 

41 

40 

38 

37 

35 

132 

61 

58 

56 

55 

53 

51 

49 

47 

45 

44 

42 

40 

39 

37 

36 

134 

61 

59 

57 

55 

53 

51 

49 

48 

46 

44 

43 

41 

39 

38 

36 

136 

61 

69 

57 

55 

54 

52 

50 

48 

46 

45 

43 

41 

40 

38 

37 

138 

62 

60 

58 

66 

54 

52 

50 

49 

47 

45 

44 

42 

40 

39 

37 

140 

62 

60 

58 

56 

54 

53 

51 

49 

47 

46 

4.4 

43 

41 

40 

38 

61 


TABLE  VI. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  30.0  inches. 


Depression  of  wet-bulb  thermometer  (t—f). 

Air 

temp. 

t 

31 

32 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

80 

0 

82 

2 

0 

84 

5 

3 

0 

86 

7 

5 

3 

1 

88 

9 

7 

5 

:-j 

1 

90 

11 

9 

7 

5 

3 

1 

92 

13 

11 

9 

V 

5 

3 

1 

94 

14 

12 

10 

0    7 

5 

3 

1 

96 

16 

14 

12 

10 

8 

7 

5 

3 

2 

0 

98 

17 

15 

14 

12 

10 

8 

7 

5 

3 

2 

0 

100 

19 

17 

15 

13 

12 

10 

8 

7 

5 

4 

2 

! 

102 

20 

18 

16 

15 

13 

11 

10 

8 

7 

5 

4 

2 

1 

104 

21 

20 

18 

16 

14 

13 

11 

10 

8 

7 

5 

4 

2 

1 

106 

23 

21 

19 

17 

16 

14 

13 

11 

10 

8 

7 

5 

4 

3 

1 

108 

24 

22 

20 

19 

17 

16 

14 

12 

11 

10 

8 

7 

5 

4 

3 

110 

25 

23 

21 

20 

18 

17 

15 

14 

12 

11 

10 

8 

7 

6 

4 

112 

26 

24 

23 

21 

19 

18 

16 

15 

14 

12 

11 

9 

8 

7 

6 

114 

27 

25 

24 

22 

20 

19 

18 

16 

15 

13 

12 

11 

9 

8 

7 

116 

28 

26 

25 

23 

22 

20 

19 

17 

16 

14 

13 

12 

11 

9 

8 

118 

29 

27 

25 

24 

23 

21 

20 

18 

17 

16 

14 

13 

12 

11 

9 

120 

29 

28 

26 

25 

23 

22 

21 

19 

18 

17 

15 

14 

13 

12 

10 

122 

30 

29 

27 

26 

24 

23 

22 

20 

19 

18 

16 

15 

14 

13 

11 

124 

31 

30 

28 

27 

25 

24 

22 

21 

20 

18 

17 

16 

15 

14 

12 

126 

32 

30 

29 

27 

26 

25 

23 

22 

21 

19 

18 

17 

16 

15 

13 

128 

33 

31 

30 

28 

27 

25 

24 

23 

22 

20 

19 

18 

17 

16 

14 

130 

33 

32 

30 

29 

28 

26 

25 

24 

22 

21 

20 

19 

18 

16 

15 

132 

34 

33 

31 

30 

28 

27 

26 

24 

23 

22 

21 

20 

18 

17 

16 

134 

35 

33 

32 

30 

29 

28 

26 

25 

24 

23 

21 

20 

19 

18 

17 

136 

35 

34 

33 

31 

30 

28 

27 

26 

25 

23 

22 

21 

20 

19 

18 

138 

36 

35 

33 

32 

30 

29 

28 

27 

25 

24 

23 

22 

21 

20 

19 

140 

37 

35 

34 

32 

31 

30 

29 

27 

26 

25 

24 

23 

21 

20 

19 

Depression  of  wet-bulb  thermometer  (t  —  f). 

( 

46 

47 

48 

49 

50 

51 

52 

53 

54 

55 

56 

57 

58 

59 

60 

106 

0 

108 

2 

0 

110 

3 

2 

1 

112 

4 

3 

2 

1 

114 

6 

5 

3 

2 

1 

116 

7 

6 

5 

4 

2 

1 

0 

118 

8 

7 

6 

5 

4 

3 

2 

1 

120 

9 

8 

7 

6 

5 

4 

3 

2 

1 

122 

10 

9 

8 

7 

6 

5 

4 

3 

2 

1 

0 

124 

11 

10 

9 

8 

7 

6 

5 

4 

3 

2 

1 

0 

126 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

2 

2 

1 

128 

13 

12 

11 

10 

9 

8 

7 

6 

5 

4 

4 

3 

2 

1 

0 

130 

14 

13 

12 

11 

10 

9 

8 

7 

6 

5 

5 

4 

3 

2 

1 

132 

15 

14' 

13 

12 

11 

10 

9 

8 

7 

6 

6 

5 

4 

3 

2 

134 

16 

15 

14 

13 

12 

11 

10 

9 

8 

7 

6 

6 

5 

4 

3 

136 

17 

16 

15 

14 

13 

12 

11 

10 

9 

8 

7 

6 

6 

5 

4 

138 

17 

16 

15 

14 

14 

13 

12 

11 

10 

9 

8 

7 

7 

6 

5 

140 

18 

17 

16 

15 

14 

13 

12 

12 

11 

10 

9 

8 

7 

7 

« 

RELATIVE  HUMIDITY 

62 

TABLE  VII. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 


Pressure  =  29.0  inches. 


Air 

Dep 

ressi 

Jll  Ol 

wet- 

bulb 

then 

nom< 

5ter( 

t-t'} 

iemp 
t 

0.2 

0.4 

0.6 

0.8 

1.0 

1.2 

1.4 

1.6 

1.8 

2.0 

12.2 

2.4 

2.6 

2.8 

3.0 

3.2 

3.4 

3.6 

3.8 

4.0 

4.2 

—  40 
—39 

OQ 

49 
51 

CO 

(t-t 

) 

—  Oc 

—37 

00 

55 

9 

t 

4.4 

4.6 

4.8 

5.0 

5  ? 

5  4 

5  6 

5  8 

fi  0 

6.2 

6.4 

6.6 

—  36 

58 

13 

9 

4 

—35 

61 

18 

10 

7 

3 

—34 

63 

22 

11 

11 

7 

3 

-33 

65 

26 

12 

14 

10 

6 

3 

—32 
—31 

66 
68 

30 
34 

3 

13 
14 

17 
20 

14 
17 

10 
13 

6 
10 

3 
6 

3 

—30 
—29 
—28 
—27 
26 

70 
72 
74 

76 

77 

38 
42 
46 
49 
52 

7 
12 
17 
22 
26 

3 

15 
16 
17 
18 
19 

23 
26 
29 

°9 

34 

20 
23 
26 
29 
31 

17 
20 
23 
25 
28 

13 
16 

19 
22 
25 

10 
13 

16 
19 

22 

6 
10 
13 
16 
19 

3 
7 
10 
13 
16 

3 
7 
10 
13 

0 
4 

7 
11 

1 

4 

8 

1 
5 

20 

36 

33 

30 

28 

25 

22 

19 

16 

14 

11 

8 

5 

—25 
—24 

78 
79 

54 
56 

30 
34 

8 
13 

(t~ 

n 

—23 

-22 

o-i 

80 
81 

68 
60 

f»n 

38 
41 
44 

18 
22 

4 

t 

0.1 

0.2 

0.3 

0.4 

0.5 

—  £1 

82 

09E 

26 

—  50 

50 

—20 

83 

64 

47 

30 

13 

—49 

54 

9 

—19 

83 

66 

50 

34 

18 

—  48 

57 

15 

—18 

84 

68 

53 

38 

22 

5 

—47 

60 

20 

—17 

85 

70 

55 

41 

26 

10 

—46 

63 

25 

—16 

86 

71 

57 

43 

29 

15 

1 

—45 

66 

30 

—15 
—14 
—13 
—12 

87 
88 
88 
89 

73 
74 

76 

77 

60 
62 
64 
65 

46 
49 
52 
54 

33 
37 
40 
43 

20 
24 
28 
31 

6 
11 
15 
20 

4 

9 

—44 
-43 
—42 
—41 

68 
70 
71 

72 

35 
39 
43 
46 

6 
11 
16 

—11 

90 

78 

67 

56 

46 

34 

23 

13 

1 

—40 

73 

49 

20 

—39 

74 

51 

24 

—10 

90 

79 

69 

58 

48 

38 

27 

17 

6 

-38 

75 

53 

27 

5 

—  9 

-  8 

90 
91 

80 
81 

70 
72 

60 
62 

51 

53 

41 
43 

31 
34 

21 
25 

11 

15 

1 

6 

—  37 
—36 

76 
77 

55 

58 

31 
35 

9 
13 

—  7 

91 

82 

73 

64 

55 

46 

37 

28 

19 

10 

2 

—35 

78 

61 

39 

18 

—  6 

92 

83 

74 

65 

57 

48 

40 

31 

23 

14 

6 

—34 

80 

63 

43 

22 

4 

—33 

81 

65 

46 

26 

9 

—  5 

92 

83 

75 

67 

59 

51 

43 

34 

26 

18 

10 

2 

—32 

82 

66 

48 

30 

13 

—  4 

92 

84 

76 

69 

61 

53 

45 

37 

30 

22 

14 

7 

—31 

83 

68 

51 

34 

18 

—  3 

93 

85 

77 

70 

62 

55 

48 

40 

33 

26 

18 

11 

3 

—30 

84 

70 

54 

38 

23 

—  2 

93 

85 

78 

71 

64 

57 

50 

43 

36 

29 

22 

15 

8 

1 

—  1 

93 

86 

79 

73 

66 

59 

52 

46 

39 

32 

26 

19 

12 

6 

0 

93 

87 

80 

74 

68 

61 

55 

48 

42 

35 

29 

23 

16 

10 

3 

+  1 

94 

87 

81 

75 

69 

63 

57 

51 

44 

38 

32 

26 

20 

14 

8 

2 

2 

94 

88 

82 

76 

71 

65 

59 

53 

47 

41 

35 

30 

24 

18 

12 

6 

n 

3 

94 

89 

83 

77 

72 

66 

61 

55 

49 

44 

38 

33 

27 

21 

10 

10 

4 

4 

94 

89 

84 

78 

73 

67 

62 

57 

51 

46 

40 

35 

30 

25 

19 

14 

8 

3 

5 

95 

89 

84 

79 

74 

69 

64 

58 

53 

48 

43 

38 

32 

27 

22 

17 

12 

7 

2 

6 

95 

90 

85 

80 

75 

70 

65 

60 

55 

50 

45 

40 

35 

30 

25 

21 

16 

11 

6 

1 

7 

95 

90 

85 

80 

76 

71 

66 

61 

56 

52 

47 

43 

38 

33 

28 

24 

19 

14 

10 

5 

0 

8 

95 

91 

86 

81 

77 

72 

68 

63 

58 

54 

49 

45 

40 

35 

31 

27 

22 

18 

13 

9 

4 

9 

95 

91 

86 

82 

78 

73 

69 

64 

60 

65 

51 

47 

42 

38 

34 

29 

25 

21 

16 

12 

8 

10 

96 

91 

87 

83 

79 

74 

70 

66 

61 

57 

53 

49 

44 

40 

36 

32 

28 

24 

19 

15 

11 

11 

96 

92 

87 

83 

79 

75 

71 

67 

63 

59 

55 

51 

46 

42 

38 

34 

30 

26 

22 

18 

14 

12 

96 

92  t 

88 

84 

80 

76 

72 

68 

64 

60 

56 

52 

48 

45 

41 

37 

33 

29 

25 

21 

18 

13 

96 

92 

88 

85 

81 

77 

73 

69 

66 

62 

58 

54 

50 

47 

43 

39 

36 

32 

28 

24 

21 

14 

96 

92 

89 

85 

82 

78 

74 

71 

67 

63 

60 

56 

52 

49 

45 

42 

38 

34 

31 

27 

24 

15 

96 

93 

89 

86 

82 

79 

75 

72 

68 

65 

61 

58 

54 

51 

47 

44 

40 

37 

34 

30 

27 

16 

97 

93 

90 

86 

83 

79 

76 

73 

70 

66 

63 

59 

56 

53 

49 

46 

43 

40 

36 

33 

29 

17 

97 

93 

no  / 

87 

84 

80 

77 

74 

71 

67 

64 

61 

58 

54 

51 

48 

45 

42 

38 

35 

32 

18 

97 

94 

90 

87 

84 

81 

78 

75 

72 

68 

65 

62 

59 

56 

53 

50 

47 

44 

41 

38 

35 

.19 

97 

94 

91 

88 

85 

82 

78 

75 

72 

69 

66 

63 

60 

57 

55 

52 

49 

46 

48 

40 

37 

«. 

97 

94 

91 

88 

85 

82 

79 

76 

73 

70 

68 

65 

62 

59 

56 

53 

50 

47 

44 

42 

33 

RELATIVE  HUMIDITY 
63 

TABLE  VII. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  29.0  inches. 


Air 
temp. 
t 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

0.5 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

8.5 

9.0 

9.5 

10.0 

10.5 

20 

92 

85 

78 

70 

63 

56 

49 

42 

35 

28 

21 

14 

7 

21 

93 

86 

78 

71 

64 

57 

50 

44 

37 

30 

24 

17 

10 

3 

22 

93 

86 

79 

72 

65 

59 

52 

45 

39 

32 

26 

19 

13 

7 

0 

23 

93 

87 

80 

73 

66 

60 

53 

47 

41 

34 

28 

22 

16 

10 

3 

2* 

94 

87 

81 

74 

68 

61 

55 

49 

42 

36 

30 

24 

18 

12 

6 

0 

25 

94 

87 

81 

75 

69 

63 

56 

50 

44 

38 

32 

27 

21 

15 

9 

4 

26 

94 

88 

82 

75 

69 

64 

58 

52 

46 

40 

34 

29 

23 

18 

12 

7 

1 

27 

94 

88 

82 

76 

70 

65 

59 

53 

48 

42 

36 

31 

26 

20 

15 

9 

4 

28 

94 

88 

82 

77 

71 

66 

60 

55 

49 

44 

38 

33 

28 

23 

17 

12 

7 

2 

29 

94 

89 

83 

78 

72 

67 

61 

56 

51 

45 

40 

35 

30 

25 

20 

15 

10 

5 

0 

30 

95 

89 

84 

78 

73 

68 

62 

57 

52 

47 

42 

37 

32 

27 

22 

17 

12 

8 

3 

31 

95 

89 

84 

79 

74 

69 

63 

58 

53 

49 

44 

39 

34 

29 

24 

20 

15 

10 

6 

1 

32 

95 

90 

85 

79 

74 

69 

65 

60 

55 

50 

45 

41 

36 

31 

26 

22 

17 

13 

9 

4 

33 

95 

90 

85 

80 

76 

71 

66 

61 

56 

52 

47 

42 

38 

33 

29 

24 

20 

16 

11 

7 

3 

34 

95 

90 

86 

81 

77 

72 

67 

62 

58 

53 

49 

44 

40 

35 

31 

27 

22 

18 

14 

9 

5 

35 

95 

91 

86 

82 

77 

73 

68 

64 

59 

55 

50 

46 

41 

37 

33 

29 

24 

20 

16 

12 

8 

36 

95 

91 

87 

82 

78 

73 

69 

65 

61 

56 

52 

48 

43 

39 

35 

31 

27 

23 

18 

14 

10 

37 

95 

91 

87 

83 

79 

74 

70 

66 

62 

58 

54 

49 

45 

41 

37 

33 

29 

25 

21 

17 

13 

38 

96 

91 

87 

83 

79 

75 

71 

67 

63 

59 

55 

51 

47 

43 

39 

35 

31 

27 

23 

19 

15 

39 

96 

92 

88 

84 

80 

76 

72 

68 

64 

60 

56 

52 

48 

44 

41 

37 

33 

29 

25 

21 

17 

40 

96 

92 

88 

84 

80 

76 

72 

68 

64 

61 

57 

53 

49 

46 

42 

38 

35 

31 

27 

23 

20 

41 

96 

92 

88 

84 

80 

77 

73 

69 

65 

62 

58 

54 

50 

47 

43 

40 

36 

33 

29 

26 

22 

42 

96 

92 

88 

85 

81 

77 

73 

70 

66 

62 

59 

55 

51 

48 

45 

41 

38 

34 

31 

28 

24 

43 

96 

92 

88 

85 

81 

78 

74 

70 

67 

63 

60 

56 

52 

49 

46 

43 

39 

36 

32 

29 

26 

44 

96 

93 

89 

85 

82 

78 

74 

71 

68 

64 

61 

57 

54 

51 

47 

44 

40 

37 

34 

31 

28 

45 

96 

93 

89 

86 

82 

79 

75 

71 

68 

65 

61 

58 

55 

52 

48 

45 

42 

39 

36 

33 

29 

46 

96 

93 

89 

86 

82 

79 

75 

72 

69 

65 

62 

59 

56 

53 

49 

46 

43 

40 

37 

34 

31 

47 

96 

93 

89 

86 

83 

79 

76 

73 

69 

66 

63 

60 

57 

54 

50 

47 

44 

41 

38 

35 

32 

48 

96 

93 

90 

87 

83 

80 

76 

73 

70 

67 

63 

60 

57 

54 

51 

48 

45 

42 

39 

36 

34 

49 

96 

93 

90 

87 

83 

80 

77 

74 

71 

67 

64 

61 

58 

55 

52 

49 

46 

43 

40 

37 

35 

60 

96 

93 

90 

87 

84 

81 

77 

74 

71 

68 

65 

62 

59 

56 

53 

50 

47 

44 

42 

39 

36 

51 

97 

94 

90 

87 

84 

81 

78 

75 

72 

69 

66 

63 

60 

57 

54 

51 

48 

45 

43 

40 

37 

52 

97 

94 

91 

88 

84 

81 

78 

75 

72 

69 

66 

63 

60 

58 

55 

52 

49 

46 

44 

41 

39 

53 

97 

94 

91 

88 

85 

82 

78 

75 

73 

70 

67 

64 

61 

58 

56 

53 

50 

47 

45 

42 

40 

54 

97 

94 

91 

88 

85 

82 

79 

76 

73 

70 

67 

65 

62 

59 

57 

54 

51 

48 

46 

43 

41 

55 

97 

94 

91 

88 

85 

82 

79 

76 

74 

71 

68 

65 

62 

60 

57 

55 

52 

49 

47 

44 

42 

56 

97 

94 

91 

88 

85 

82 

79 

77 

74 

71 

69 

66 

63 

61 

58 

55 

53 

50 

48 

45 

43 

57 

97 

94 

91 

88 

85 

83 

80 

77 

74 

72 

69 

66 

64 

61 

59 

56 

53 

51 

49 

46 

44 

58 

97 

94 

91 

89 

86 

83 

80 

77 

75 

72 

69 

67 

64 

62 

60 

57 

54 

52 

49 

47 

45 

59 

97 

94 

92 

89 

86 

83 

81 

78 

75 

73 

70 

68 

65 

63 

60 

58 

55 

53 

50 

48 

45 

60 

97 

94 

92 

89 

86 

84 

81 

78 

76 

73 

71 

68 

65 

63 

61 

58 

56 

53 

51 

49 

46 

61 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

71 

68 

66 

64 

61 

59 

56 

54 

52 

50 

47 

62 

97 

94 

92 

89 

87 

84 

81 

79 

77 

74 

72 

69 

66 

64 

62 

60 

57 

55 

53 

50 

48 

63 

97 

95 

92 

90 

87 

84 

82 

79 

77 

74 

72 

70 

67 

65 

62 

60 

58 

56 

53 

51 

49 

64 

97 

95 

92 

90 

87 

85 

82 

79 

77 

75 

72 

70 

68 

66 

63 

61 

58 

56 

54 

52 

50 

65 

97 

95 

92 

90 

87 

85 

82 

80 

78 

75 

73 

70 

68 

66 

64 

62 

59 

57 

55 

53 

50 

66 

97 

95 

92 

90 

87 

85 

83 

80 

78 

76 

73 

71 

68 

66 

64 

62 

60 

58 

55 

53 

51 

«7 

97 

95 

92 

90 

88 

85 

83 

80 

78 

76 

73 

71 

69 

67 

65 

62 

60 

58 

56 

54 

52 

68 

97 

95 

93 

90 

88 

85 

83 

81 

78 

76 

74 

72 

69 

67 

65 

63 

61 

59 

57 

55 

53 

69 

97 

95 

93 

90 

88 

86 

83 

81 

79 

77 

74 

72 

70 

68 

66 

64 

61 

59 

57 

55 

53 

70 

98 

95 

93 

90 

88 

86 

83 

81 

79 

77 

75 

72 

70 

68 

66 

64 

62 

60 

58 

56 

54 

71 

98 

95 

93 

90 

88 

86 

84 

82 

79 

77 

75 

73 

71 

69 

67 

64 

62 

60 

58 

56 

54 

72 

98 

95 

93 

91 

89 

86 

84 

82 

80 

78 

75 

73 

71 

69 

67 

65 

63 

61 

59 

57 

55 

73 

98 

95 

93 

91 

89 

86 

84 

82 

80 

78 

76 

73 

71 

69 

67 

65 

63 

tl 

60 

58 

56 

74 

98 

95 

93 

91 

89 

86 

84 

82 

80 

78 

76 

74 

72 

70 

68 

66 

64 

62 

60 

58 

56 

75 

98 

96 

93 

91 

89 

87 

84 

82 

80 

78 

76 

74 

72 

70 

68 

66 

64 

63 

61 

59 

57 

76 

98 

96 

93 

91 

8!) 

87 

85 

83 

80 

78 

76 

74 

72 

70 

69 

67 

65 

63 

61 

59 

57 

77 

98 

96 

93 

91 

8!) 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

67 

65 

63 

61 

60 

58 

78 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

67 

66 

64 

62 

60 

58 

79 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

70 

68 

66 

64 

62 

60 

59 

80 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

76 

74 

72 

70 

68 

66 

64 

63 

61 

59 

RELATIVE  HUMIDITY 
64 

TABLE  VII  —Relative  humidity,  per  cent  Fahrenheit  temperatures. 


Pressure =29.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t—  f). 

tern  p. 

11.0 

11.5 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

15.0 

15.5 

16.0 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

20.0 

20.5 

21.0 

34 

1 

35 

4 

36 

6 

3 

37 

9 

5 

1 

38 

12 

8 

4 

0 

39 

14 

10 

7 

3 

40 

16 

13 

9 

6 

2 

41 

18 

15 

11 

8 

6 

1 

42 

21 

17 

14 

10 

7 

4 

0 

43 

23 

19 

16 

1 

3 

9 

6 

3 

44 

24 

21 

18 

15 

12 

9 

5 

2 

45 

26 

23 

20 

17 

14 

11 

8 

5 

2 

46 

28 

25 

22 

19 

16 

13 

10 

7 

4 

1 

47 

29 

26 

23 

1 

0 

17 

15 

12 

9 

6 

3 

1 

48 

31 

28 

25 

22 

19 

16 

14 

11 

8 

6 

3 

0 

49 

32 

29 

26 

24 

21 

18 

15 

13 

10 

7 

5 

2 

50 

33 

31 

28 

25 

22 

20 

17 

14 

12 

9 

7 

4 

2 

51 

35 

32 

29 

fj. 

7 

24 

21 

19 

16 

14 

11 

9 

6 

4 

1 

52 

36 

33 

30 

28 

25 

23 

20 

18 

15 

13 

10 

8 

6 

3 

0 

53 

37 

34 

32 

S 

9 

27 

24 

22 

19 

17 

15 

12 

10 

7 

5 

3 

0 

64 

38 

35 

33 

30 

28 

26 

23 

21 

18 

16 

14 

12 

9 

7 

6 

2 

0 

65 

39 

37 

34 

32 

29 

27 

25 

22 

20 

18 

15 

13 

11 

9 

6 

4 

2 

56 

40 

38 

35 

33 

31 

28 

26 

24 

21 

19 

17 

15 

12 

10 

8 

6 

4 

2 

57 

41 

39 

36 

S 

4 

32 

29 

27 

25 

23 

20 

18 

16 

14 

12 

10 

7 

5 

3 

1 

58 

42 

40 

38 

35 

33 

31 

28 

26 

24 

22 

20 

17 

15 

13 

11 

9 

7 

5 

3 

1 

59 

43 

41 

39 

36 

34 

32 

30 

27 

25 

23 

21 

19 

17 

15 

13 

11 

9 

7 

5 

3 

1 

60 

44 

42 

40 

37 

35 

33 

31 

29 

27 

25 

22 

20 

18 

16 

14 

12 

10 

8 

6 

4 

2 

61 

45 

43 

40 

g 

8 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

14 

12 

10 

8 

6 

4 

62 

46 

44 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

17 

15 

13 

11 

9 

8 

6 

83 

47 

45 

42 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

14 

13 

11 

9 

7 

64 

48 

45 

43 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

22 

20 

18 

16 

14 

12 

11 

9 

65 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

25 

23 

21 

19 

17 

15 

13 

12 

10 

66 

49 

47 

45 

4 

3 

41 

39 

37 

35 

33 

31 

29 

27 

26 

24 

22 

20 

18 

17 

15 

13 

11 

67 

50 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

29 

27 

25 

23 

21 

20 

18 

16 

15 

13 

68 

51 

49 

47 

4 

5 

43 

41 

39 

37 

35 

33 

31 

30 

28 

26 

24 

23 

21 

19 

17 

16 

14 

69 

51 

49 

47 

45 

44 

42 

40 

38 

36 

34 

32 

31 

29 

27 

25 

24 

22 

20 

19 

17 

15 

70 

52 

50 

48 

46 

44 

42 

40 

39 

37 

35 

33 

32 

30 

28 

26 

25 

23 

21 

20 

18 

17 

71 

53 

51 

49 

4 

7 

45 

43 

41 

39 

38 

36 

34 

32 

31 

29 

27 

26 

24 

22 

21 

19 

18 

72 

53 

51 

49 

48 

46 

44 

42 

40 

39 

37 

35 

33 

32 

30 

28 

27 

25 

23 

22 

20 

19 

73 

54 

52 

50 

4 

8 

46 

45 

43 

41 

40 

38 

36 

34 

33 

31 

29 

28 

26 

24 

23 

21 

20 

74 

54 

53 

51 

49 

47 

45 

44 

42 

40 

39 

37 

35 

34 

32 

30 

29 

27 

25 

24 

22 

21 

75 

55 

53 

51 

50 

48 

46 

44 

43 

41 

39 

38 

36 

34 

33 

31 

30 

28 

26 

25 

23 

22 

76 

55 

54 

52 

50 

48 

47 

45 

43 

42 

40 

38 

37 

35 

34 

32 

30 

29 

27 

26 

24 

23 

77 

56 

54 

52 

5 

1 

49 

47 

46 

44 

42 

41 

39 

37 

36 

34 

33 

31 

30 

28 

27 

25 

24 

78 

57 

55 

53 

51 

50 

48 

46 

45 

43 

41 

40 

38 

37 

35 

34 

32 

31 

29 

28 

26 

25 

79 

57 

55 

54 

52 

50 

49 

47 

45 

44 

42 

41 

39 

37 

36 

34 

33 

31 

30 

29 

27 

26 

80 

57 

56 

54 

52 

51 

49 

47 

46 

44 

43 

41 

40 

38 

37 

35 

34 

32 

31 

29 

28 

27 

Depression  of  wet-bulb  thermometer  (t  —  f). 

t 

21.5 

22.0 

22.5 

23.0  23.5 

24.0 

24.5 

25.0 

25.5 

26.0 

26.6 

27.0 

27.  S 

28.0 

28.5 

29.0 

29.5 

30.0 

30.fi 

31.0 

60 

1 

61 

2 

0 

62 

4 

2 

0 

63 

5 

4 

2 

0 

64 

7 

5 

3 

2 

65 

8 

7 

5 

3    2 

66 

10 

8 

6 

5    3 

1 

67 

11 

9 

8 

6    5 

3 

1 

68 

12 

11 

9 

8    6 

4 

3 

1 

69 

14 

12 

10 

9    7 

6 

4 

3 

1 

70 

15 

13 

12 

10    9 

7 

6 

4 

3 

1 

71 

16 

15 

13 

11   10 

8 

7 

5 

4 

3 

1 

72 

17 

16 

14 

13   11 

10 

8 

7 

5 

4 

2 

1 

73 

18 

17 

15 

14   12 

11 

9 

8 

7 

5 

4 

2 

1 

74 

19 

18 

16 

15   14 

12 

11 

9 

8 

7 

5 

4 

2 

1 

75 

20 

19 

17 

16   15 

13 

12 

11 

9 

8 

6 

5 

4 

2 

1 

76 

21 

20 

19 

17   16 

14 

13 

12 

10 

9 

8 

6 

5 

4 

2 

1 

77 

22 

21 

20 

18   17 

15 

14 

13 

11 

10 

9 

7 

6 

5 

4 

2 

1 

78 

23 

22 

21 

19   18 

16 

15 

14 

12 

11 

10 

9 

7 

6 

5 

4 

2 

1 

0 

79 

24 

23 

21 

20   19 

17 

16 

15 

13 

12 

11 

10 

8 

7 

6 

5 

4 

2 

1 

0 

80 

25 

24 

22 

21   20 

18 

17 

16 

14 

13 

12 

11 

9 

8 

7 

6 

6 

4 

2 

1 

RELATIVE  HUMIDITY 
65 

TABLE  VII. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure =29.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

temp. 
t. 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

80 

96 

91 

87 

83 

79 

76 

72 

68 

64 

61 

57 

54 

51 

47 

44 

82 

96 

92 

88 

84 

80 

76 

72 

69 

65 

62 

58 

55 

52 

49 

46 

84 

96 

92 

88 

84 

80 

77 

73 

70 

66 

63 

59 

56 

53 

50 

47 

86 

96 

92 

88 

85 

81 

77 

74 

70 

67 

63 

60 

57 

54 

51 

48 

88 

96 

92 

88 

85 

81 

78 

74 

71 

67 

64 

61 

58 

55 

52 

49 

90 

96 

92 

89 

85 

81 

78 

75 

71 

68 

65 

62 

59 

56 

53 

50 

92 

96 

92 

89 

85 

82 

78 

75 

72 

69 

65 

62 

59 

57 

54 

51 

94 

96 

93 

89 

86 

82 

79 

75 

72 

69 

66 

63 

60 

57 

54 

52 

96 

96 

93 

89 

86 

82 

79 

76 

73 

70 

67 

64 

61 

58 

55 

53 

98 

96 

93 

89 

86 

83 

79 

76 

73 

70 

67 

64 

61 

59 

56 

53 

100 

96 

93 

90 

86 

83 

80 

77 

74 

71 

68 

65 

62 

59 

57 

54 

102 

96 

93 

90 

86 

83 

80 

77 

74 

71 

68 

65 

63 

60 

57 

56 

104 

97 

93 

90 

87 

84 

80 

77 

74 

72 

69 

66 

63 

61 

58 

56 

106 

97 

93 

90 

87 

84 

81 

78 

75 

72 

69 

66 

64 

61 

59 

56 

108 

97 

93 

90 

87 

84 

81 

78 

75 

72 

70 

67 

64 

62 

59 

57 

110 

97 

94 

90 

87 

84 

81 

78 

76 

73 

70 

67 

65 

62 

60 

57 

112 

97 

94 

90 

87 

84 

82 

79 

76 

73 

70 

68 

65 

63 

SO 

58 

114 

97 

94 

91 

88 

85 

82 

79 

76 

74 

71 

68 

66 

63 

61 

59 

116 

97 

94 

91 

88 

85 

82 

79 

77 

74 

71 

69 

66 

64 

61 

59 

118 

97 

94 

91 

88 

85 

82 

79 

77 

74 

72 

69 

67 

64 

62 

60 

120 

97 

94 

91 

88 

85 

82 

80 

77 

74 

72 

69 

67 

65 

62 

60 

122 

97 

94 

91 

88 

85 

83 

80 

77 

75 

72 

70 

67 

65 

63 

61 

124 

97 

94 

91 

88 

86 

83 

80 

78 

75 

73 

70 

68 

65 

63 

61 

126 

97 

94 

91 

89 

86 

83 

81 

78 

75 

73 

71 

68 

66 

64 

62 

•  128 

97 

94 

91 

89 

86 

83 

81 

78 

76 

73 

71 

69 

66 

64 

62 

130 

97 

94 

92 

89 

86 

84 

81 

78 

76 

74 

71 

69 

67 

65 

62 

132 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

72 

69 

67 

65 

65 

134 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

72 

70 

67 

65 

63 

136 

97 

94 

92 

89 

87 

84 

82 

79 

77 

74 

72 

70 

68 

66 

64 

138 

97 

94 

92 

89 

87 

84 

82 

79 

77 

75 

72 

70 

68 

66 

64 

140 

97 

95 

92 

89 

87 

84 

82 

80 

77 

73 

73 

71 

68 

66 

64 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

t. 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

80 

41 

38 

35 

32 

29 

27 

24 

21 

18 

16 

13 

11 

8 

6 

4 

82 

43 

40 

37 

34 

31 

28 

25 

23 

20 

18 

15 

13 

10 

8 

6 

84 

44 

41 

38 

35 

32 

30 

27 

25 

22 

20 

17 

15 

12 

10 

8 

86 

45 

42 

39 

37 

34 

31 

29 

26 

24 

21 

19 

17 

14 

12 

10 

88 

46 

43 

41 

38 

35 

33 

30 

28 

25 

23 

21 

18 

16 

14 

12 

90 

47 

44 

42 

39 

37 

34 

32 

29 

27 

24 

22 

20 

18 

16 

14 

92 

48 

45 

43 

40 

38 

35 

33 

30 

28 

26 

24 

22 

19 

17 

15 

94 

49 

46 

44 

41 

39 

36 

34 

32 

29 

27 

25 

23 

21 

19 

17 

96 

50 

47 

45 

42 

40 

37 

35 

33 

31 

29 

26 

24 

22 

20 

18 

98 

51 

48 

46 

43 

41 

39 

36 

34 

32 

30 

28 

26 

24 

22 

20 

100 

52 

49 

47 

44 

42 

40 

37 

35 

33 

31 

29 

27 

25 

23 

21 

102 

52 

50 

47 

45 

43 

41 

38 

36 

34 

32 

30 

28 

26 

24 

22 

104 

53 

51 

48 

46 

44 

41 

39 

37 

35 

33 

31 

29 

27 

25 

24 

106 

54 

51 

49 

47 

45 

42 

40 

38 

36 

34 

32 

30 

28 

27 

an 

108 

54 

52 

50 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

28 

26 

110 

55 

53 

50 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

29 

27 

112 

56 

53 

51 

49 

47 

45 

43 

41 

39 

37 

35 

33 

31 

30 

28 

114 

56 

54 

52 

50 

48 

45 

43 

41 

40 

38 

36 

34 

32 

31 

29 

116 

57 

55 

52 

50 

48 

46 

44 

42 

40 

38 

37 

35 

33 

31 

30 

118 

57 

55 

53 

51 

49 

47 

45 

43 

41 

39 

37 

36 

34 

32 

31 

120 

58 

56 

54 

51 

49 

47 

46 

44 

42 

40 

'38 

36 

35 

33 

31 

122 

58 

56 

54 

52 

50 

48 

46 

44 

42 

41 

39 

37 

36 

34 

32 

124 

59 

57 

55 

53 

51 

49 

47 

45 

43 

41 

40 

38 

36 

35 

33 

126 

59 

57 

55 

53 

51 

49 

47 

46 

44 

42 

40 

39 

37 

35 

34 

128 

60 

58 

56 

54 

52 

50 

48 

46 

44 

43 

41 

39 

38 

36 

34 

130 

60 

58 

56 

54 

52 

50 

49 

47 

45 

43 

42 

40 

38 

37 

35 

132 

61 

59 

57 

55 

53 

51 

49 

47 

46 

44 

42 

41 

39 

37 

36 

134 

61 

59 

57 

55 

53 

51 

50 

48 

46 

44 

43 

41 

40 

38 

36 

136 

61 

59 

58 

56 

54 

52 

50 

48 

47 

45 

43 

42 

40 

39 

37 

138 

62 

60 

58 

56 

54 

52 

51 

49 

47 

45 

44 

42 

41 

39 

38 

140 



62 

60 

58 

56 

55 

53 

51 

49 

48 

46 

44 

43 

41 

40 

38 

9161°— 15- 


66 


TABLE  VII. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =>  29. 0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

toinp. 

t 

31 

32 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

80 

1 

82 

4 

1 

84 

« 

4 

2 

86 

8 

6 

4 

2 

88 

10 

8 

6 

4 

2 

90 

12 

10 

8 

6 

4 

2 

0 

92 

13 

11 

9 

8 

6 

4 

2 

0 

54 

15 

13 

11 

9 

8 

6 

4 

2 

1 

96 

17 

15 

13 

11 

9 

7 

6 

4 

3 

1 

98 

18 

16 

14 

13 

11 

9 

7 

6 

4 

3 

1 

100 

19 

18 

16 

14 

12 

11 

9 

7 

6 

4 

3 

1 

102 

20 

19 

17 

15 

14 

12 

11 

9 

7 

6 

4 

3 

2 

0 

104 

22 

20 

18 

17 

15 

14 

12 

10 

9 

7 

6 

5 

3 

2 

1 

106 

23 

21 

20 

18 

16 

15 

13 

12 

10 

9 

7 

6 

5 

3 

2 

108 

24 

22 

21 

19 

18 

16 

15 

13 

12 

10 

9 

7 

6 

5 

4 

110 

25 

24 

22 

20 

19 

17 

16 

14 

13 

11 

10 

9 

7 

6 

5 

112 

26 

25 

23 

21 

20 

18 

17 

15 

14 

13 

11 

10 

9 

8 

6 

114 

27 

26 

24 

22 

21 

19 

18 

17 

15 

14 

13 

11 

10 

9 

8 

116 

28 

27 

25 

23 

22 

20 

19 

18 

16 

15 

14 

12 

11 

10 

9 

118 

29 

27 

26 

24 

23 

21 

20 

19 

17 

16 

15 

13 

12 

11 

10 

120 

30 

28 

27 

25 

24 

22 

21 

20 

18 

17 

16 

15 

13 

12 

11 

122 

31 

29 

28 

26 

25 

23 

22 

21 

19 

18 

17 

15 

14 

13 

12 

124 

31 

30 

29 

27 

26 

24 

23 

21 

20 

19 

18 

16 

15 

14 

13 

126 

32 

31 

29 

28 

26 

25 

24 

22 

21 

20 

19 

17 

16 

15 

14 

128 

33 

31 

30 

2P 

27 

26 

24 

23 

22 

21 

19 

18 

17 

16 

15 

130 

34 

32 

31 

29 

28 

27 

25 

24 

23 

22 

20 

19 

18 

17 

16 

132 

34 

33 

31 

30 

29 

27 

26 

25 

23 

22 

21 

20 

19 

18 

17 

134 

35 

34 

32 

31 

29 

28 

27 

25 

24 

23 

22 

21 

20 

18 

17 

136 

36 

34 

33 

31 

30 

29 

27 

26 

25 

24 

23 

21 

20 

19 

18 

138 

36 

35 

33 

32 

31 

29 

28 

27 

26 

24 

23 

22 

21 

20 

19 

140 

37 

35 

34 

33 

31 

30 

29 

28 

26 

25 

24 

23 

22 

21 

20 

Depression  of  wet-bulb  thermometer  (t—f). 

t 

46 

47 

48 

49 

50 

51 

52 

53 

54 

55 

56 

57 

58 

59 

60 

106 

1 

108 

2 

1 

110 

4 

3 

1 

0 

112 

5 

4 

3 

2 

0 

114 

6 

5 

4 

3 

2 

1 

116 

8 

6 

5 

4 

3 

2 

1 

118 

9 

8 

6 

5 

4 

3 

2 

1 

0 

120 

10 

9 

8 

6 

5 

4 

3 

2 

1 

1 

122 

11 

10 

9 

8 

7 

6 

5 

4 

3 

2 

1 

124 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

2 

1 

0 

126 

13 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

2 

1 

0 

128 

14 

13 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

2 

2 

1 

130 

15 

14 

13 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

3 

2 

132 

15 

14 

13 

12 

11 

10 

10 

9 

8 

7 

6 

5 

4 

3 

3 

134 

16 

15 

14 

13 

12 

11 

10 

9 

9 

8 

7 

6 

5 

4 

4 

136 

17 

16 

15 

14 

13 

12 

11 

10 

9 

9 

8 

7 

6 

5 

5 

138 

18 

17 

16 

15 

14 

13 

12 

11 

10 

9 

9 

8 

7 

6 

5 

140 

19 

18 

17 

16 

15 

14 

13 

12 

11 

10 

9 

9 

8 

7 

6 

TABLE  VIII.—  Relative  humidity,  per  cent—Fahrenheit  temperatures. 

Pressure  =  27. 0  inches. 


Air 

tcnip 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

t 

.2 

.4 

.6 

.8 

1.0 

1.2 

1.4 

1.6 

1.8 

2.0 

2.2 

2.4 

2.6 

2.8 

3.0  3.2 

3.4 

3.6 

3.8 

4.0 

4.2 

—  40 
—39 

51 
53 

0 

7 

(t-f) 

—38 

55 

11 

I 

—37 

57 

15 

4.4 

4.6 

4.8 

5.0 

5.2 

5.4 

5.6 

5.8 

6.0 

6.2 

6.4 

6.6 

6.8 

7.0 

—36 

60 

19 

—35 

63 

24 

7 
8 

1 
5 

1 

—34 

65 

28 

9 

9 

5 

1 

—33 

67 

32 

—32 

68 

35 

8 

10 

12 

8 

4 

1 

—31 

70 

38 

9 

11 

15 

12 

8 

4 

0 

12 

18 

15 

11 

8 

4 

0 

13 

21 

18 

15 

11 

8 

4 

1 

—30 

72 

42 

14 

14 

24 

21 

18 

15 

11 

8 

5 

1 

—29 

73 

46 

18 

—28 

75 

49 

23 

15 

27 

24 

21 

18 

14 

11 

8 

5 

2 

—27 

77 

52 

27 

5 

16 

30 

27 

24 

21 

18 

15 

11 

8 

5 

2 

—26 

78 

55 

30 

9 

17 

33 

30 

27 

24 

21 

18 

15 

12 

9 

6 

3 

18 

86 

32 

29 

26 

23 

20 

18 

15 

12 

9 

6 

4 

1 

—25 
—24 

79 
79 

57 
59 

35 

38 

13 
18 

19 

20 

37 
39 

34 
37 

32 
34 

29 
31 

26 

28 

23 
26 

21 
23 

18 
21 

15 

18 

12 
15 

10 
13 

7 
10 

4 

7 

1 
ft 

—23 
—22 

80 
81 

60 
62 

42 
45 

23 

28 

5 
10 

J 

(t-t 

) 

—  21 

82 

65 

48 

31 

14 

.1 

.2 

.3 

.4 

.5 

—20 
—19 

83 

84 

66 

68 

50 
53 

35 

38 

19 
23 

2 
7 

—51 

50 

—18 

85 

70 

55 

41 

27 

11 

-50 

54 

5 

—17 

86 

71 

57 

44 

30 

16 

2 

-49 

58 

14 

—16 

87 

73 

60 

47 

34 

21 

8 

—48 

61 

20 

-47 

63 

25 

—15 

88 

74 

62 

50 

37 

25 

12 

-46 

66 

30 

-14 

88 

76 

64 

53 

40 

28 

16 

4 

-45 

69 

34 

0 

—13 

89 

77 

66 

55 

43 

32 

21 

10 

-44 

71 

38 

6 

—12 

89 

78 

67 

57 

46 

36 

25 

14 

4 

—43 

73 

42 

12 

—11 

90 

79 

69 

59 

49 

39 

28 

18 

8 

-42 

74 

46 

17 

—41 

75 

49 

22 

—10 

91 

80 

71 

61 

51 

42 

32 

22 

12 

3 

-40 

75 

51 

26 

0 

—  9 

91 

81 

72 

63 

54 

44 

35 

26 

17 

7 

-39 

76 

53 

29 

7 

—  8 

91 

82 

73 

65 

56 

47 

38 

29 

20 

12 

3 

-38 

77 

55 

33 

11 

—  7 

92 

83 

75 

66 

58 

49 

41 

32 

24 

16 

8 

-37 

78 

57 

36 

15 

—  6 

92 

84 

76 

68 

60 

51 

44 

35 

27 

19 

12 

4 

-36 

79 

60 

40 

19 

0 

—35 

80 

63 

43 

24 

4 

—  5 

92 

84 

77 

69 

62 

54 

46 

38 

31 

23 

15 

8 

0 

—34 

81 

65 

46 

28 

9 

—  4 

93 

85 

78 

71 

63 

56 

49 

41 

34 

26 

19 

12 

5 

-33 

82 

67 

49 

32 

14 

0 

93 

86 

79 

72 

65 

58 

51 

44 

37 

30 

23 

16 

9 

2 

—32 

84 

68 

51 

35 

18 

—  2 

93 

86 

79 

73 

66 

60 

53 

47 

40 

33 

26 

20 

13 

7 

0 

-31 

85 

70 

54 

38 

23 

—  1 

93 

87 

80 

74 

68 

62 

55 

49 

42 

36 

30 

24 

17 

11 

4 

—30 

86 

72 

57 

42 

28 

0 

94 

88 

81 

75 

69 

63 

57 

51 

45 

39 

33 

27 

21 

15 

9 

3 

+  I 

94 

88 

82 

77 

71 

65 

59 

53 

48 

42 

36 

30 

25 

19 

13 

8 

1 

2 

94 

89 

83 

78 

72 

67 

61 

55 

50 

45 

39 

34 

28 

23 

17 

12 

'6 

0 

3 

95 

89 

84 

79 

73 

68 

63 

57 

52 

47 

42 

36 

31 

26 

21 

16 

10 

5 

4 

95 

90 

84 

79 

74 

69 

64 

59 

54 

49 

44 

39 

34 

29 

24 

19 

14 

9 

4 

5 

95 

90 

85 

80 

75 

70 

66 

61 

56 

51 

46 

41 

36 

32 

27 

22 

17 

12 

8 

3 

6 

95 

90 

86 

81 

76 

72 

67 

62 

57 

53 

48 

44 

39 

34 

30 

25 

20 

16 

11 

7 

2 

7 

95 

91 

86 

82 

77 

73 

68 

63 

69 

55 

50 

46 

41 

37 

32 

28 

23 

19 

15 

10 

6 

8 

95 

91 

87 

82 

78 

74 

69 

65 

60 

56 

52 

48 

43 

39 

35 

31 

2H 

22 

18 

14 

9 

9 

96 

91 

87 

83 

79 

75 

70 

66 

62 

58 

54 

50 

45 

41 

37 

33 

29 

25 

21 

17 

13 

10 

96 

92 

88 

84 

80 

76 

71 

68 

64 

59 

55 

51 

47 

43 

39 

35 

32 

28 

24 

20 

16 

11 

96 

92 

88 

84 

80 

76 

72 

69 

65 

61 

57 

53 

49 

45 

42 

38 

34 

30 

27 

23 

19 

12 

96 

92 

89 

85 

81 

77 

74 

70 

66 

62 

59 

55 

51 

47 

44 

40 

36 

33 

29 

26 

22 

13 

96 

93 

89 

85 

82 

78 

75 

71 

67 

64 

60 

57 

53 

50 

46 

42 

39 

35 

32 

28 

2o 

14 

97 

93 

90 

86 

83 

79 

76 

72 

69 

65 

62 

58 

55 

51 

48 

45 

41 

38 

34 

31 

28 

15 

97 

93 

90 

87 

83 

80 

77 

73 

70 

67 

63 

60 

57 

53 

50 

47 

44 

40 

37 

34 

3C 

16 

97 

93 

90 

87 

84 

81 

77 

74 

71 

68 

65 

61 

58 

55 

52 

49 

46 

43 

39 

36 

33 

17 

97 

94 

91 

87 

84 

81 

78 

75 

72 

69 

66 

63 

60 

57 

54 

51 

48 

45 

42 

39 

36 

18 

97 

94 

91 

88 

85 

82 

79 

76 

73 

70 

67 

64 

61 

58 

55 

52 

49 

47 

44 

41 

38 

19 

97 

94 

91 

88 

85 

82 

79 

77 

74 

71 

68 

65 

62 

60 

57 

54 

51 

48 

46 

43 

40 

20 

97 

94 

92 

89 

86 

83 

80 

77 

75 

72 

69 

66 

64 

61 

58 

55 

53 

60 

47 

45 

42 

68 


TABLE  VIII. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  27. 0  inches. 


Air 

temp. 

Depression  of  wet-bulb  thermometer  (<—<')• 

t 

0.6 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

8.5 

9.0 

9.5 

10.0 

10.5 

20 

93 

86 

79 

72 

65 

58 

51 

45 

38 

31 

24 

18 

11 

5 

21 

93 

86 

79 

73 

66 

59 

53 

46 

40 

33 

27 

21 

14 

8 

2 

22 

94 

87 

80 

73 

67 

61 

54 

48 

42 

35 

29 

23 

17 

11 

5 

23 

94 

87 

80 

74 

68 

62 

56 

49 

43 

37 

31 

25 

20 

14 

8 

2 

*  24 

94 

87 

81 

75 

69 

63 

57 

51 

45 

39 

33 

28 

22 

16 

11 

5 

25 

94 

88 

82 

76 

70 

64 

58 

53 

47 

41 

35 

30 

24 

19 

13 

8 

3 

26 

94 

88 

82 

77 

71 

65 

60 

54 

48 

43 

37 

32 

27 

21 

16 

11 

6 

1 

27 

95 

89 

83 

77 

72 

66 

61 

55 

50 

45 

39 

34 

29 

24 

19 

13 

8 

3 

28 

95 

89 

83 

78 

73 

67 

62 

57 

51 

46 

41 

36 

31 

26 

21 

16 

11 

6 

2 

29 

95 

89 

84 

79 

73 

68 

63 

58 

53 

48 

43 

38 

33 

28 

23 

19 

14 

9 

4 

30 

95 

90 

84 

79 

74 

69 

64 

59 

54 

49 

44 

40 

35 

30 

26 

21 

16 

12 

7 

3 

31 

95 

90 

85 

80 

75 

70 

65 

60 

55 

51 

46 

41 

37 

32 

28 

23 

19 

14 

10 

5 

1 

32 

95 

90 

85 

80 

75 

71 

66 

61 

57 

52 

47 

43 

38 

34 

30 

25 

21 

17 

12 

8 

4 

33 

95 

91 

86 

81 

76 

72 

67 

63 

58 

54 

49 

45 

40 

36 

32 

27 

23 

19 

15 

11 

7 

34 

95 

91 

87 

82 

77 

73 

68 

64 

59 

55 

51 

46 

42 

38 

34 

30 

25 

21 

17 

13 

9 

35 

96 

91 

87 

82 

78 

74 

70 

65 

61 

56 

52 

48 

44 

40 

36 

32 

28 

24 

20 

16 

12 

36 

96 

91 

87 

83 

79 

75 

71 

66 

62 

58 

54 

50 

46 

42 

38 

34 

30 

26 

22 

18 

14 

37 

96 

92 

88 

84 

80 

75 

71 

67 

63 

59 

55 

51 

47 

43 

3!) 

35 

32 

28 

24 

20 

16 

38 

96 

92 

88 

84 

80 

76 

72 

68 

64 

61 

57 

53 

49 

45 

41 

37 

33 

30 

26 

22 

19 

39 

96 

92 

88 

84 

80 

76 

73 

69 

65 

62 

58 

54 

50 

47 

43 

39 

35 

32 

28 

24 

21 

40 

96 

92 

88 

84 

81 

77 

73 

69 

66 

62 

58 

55 

51 

48 

44 

41 

37 

33 

30 

26 

23 

41 

96 

92 

89 

85 

81 

77 

74 

70 

66 

63 

59 

56 

52 

49 

45 

42 

39 

35 

32 

28 

25 

42 

96 

92 

89 

85 

82 

78 

74 

71 

67 

64 

60 

57 

53 

60 

47 

44 

40 

37 

33 

30 

27 

43 

96 

92 

89 

86 

82 

78 

75 

71 

68 

65 

61 

58 

54 

51 

48 

45 

41 

38 

35 

32 

29 

44 

97 

93 

89 

86 

82 

79 

75 

72 

69 

66 

62 

59 

55 

52 

49 

46 

43 

40 

36 

33 

30 

45 

97 

93 

90 

86 

83 

79 

76 

72 

69 

66 

63 

60 

56 

53 

50 

47 

44 

41 

38 

35 

32 

46 

97 

93 

90 

86 

83 

80 

76 

73 

70 

67 

63 

60 

57 

54 

51 

48 

45 

42 

39 

36 

33 

47 

97 

93 

90 

86 

83 

80 

77 

74 

70 

67 

64 

61 

58 

55 

52 

49 

46 

43 

40 

37 

34 

48 

97 

93 

90 

87 

84 

80 

77 

74 

71 

68 

65 

62 

59 

56 

53 

50 

47 

44 

42 

39 

36 

49 

97 

93 

90 

87 

84 

81 

78 

74 

71 

69 

66 

63 

60 

57 

54 

51 

48 

45 

43 

40 

37 

50 

97 

94 

90 

87 

84 

81 

78 

75 

72 

69 

66 

63 

60 

57 

54 

52 

49 

46 

44 

41 

38 

51 

97 

94 

91 

88 

84 

82 

79 

76 

73 

70 

67 

64 

61 

58 

55 

53 

50 

47 

45 

42 

39 

62 

97 

94 

91 

88 

85 

82 

79 

76 

73 

70 

07 

65 

62 

59 

56 

53 

51 

48  46 

43 

41 

53 

97 

94 

91 

88 

85 

82 

79 

76 

73 

71 

68 

65 

62 

60 

57 

54 

52 

49 

47 

44 

42 

54 

97 

94 

91 

88 

85 

82 

80 

77 

74 

71 

68 

66 

63 

60 

58 

55 

53 

50 

48 

45 

43 

55 

97 

94 

91 

88 

85 

82 

80 

77 

75 

72 

69 

66 

64 

61 

59 

56 

53 

51 

49 

46 

44 

56 

97 

94 

91 

89 

86 

83 

80 

77 

75 

72 

70 

67 

64 

62 

59 

57 

54 

52 

49 

47 

44 

57 

97 

94 

91 

89 

86 

83 

80 

78 

75 

72 

70 

67 

65 

62 

60 

57 

55 

52 

50 

48 

45 

58 

97 

94 

91 

89 

86 

83 

81 

78 

76 

73 

70 

68 

65 

63 

60 

58 

55 

53 

51 

49 

46 

59 

97 

95 

92 

89 

86 

84 

81 

78 

76 

74 

71 

68 

66 

64 

61 

59 

56 

54 

52 

49 

47 

60 

97 

95 

92 

89 

87 

84 

81 

79 

76 

74 

71 

69 

66 

64 

62 

59 

57 

55 

53 

50 

48 

61 

97 

95 

92 

90 

87 

84 

82 

79 

77 

74 

72 

69 

67 

65 

62 

60 

57 

55 

53 

51 

49 

62 

97 

95 

92 

90 

87 

84 

82 

79 

77 

75 

72 

70 

67 

65 

63 

61 

58 

56 

54 

52 

50 

63 

97 

95 

92 

90 

87 

85 

82 

80 

77 

75 

73 

70 

68 

66 

63 

61 

59 

57 

55 

52 

50 

64 

97 

95 

92 

90 

87 

85 

83 

80 

78 

75 

73 

71 

68 

66 

64 

62 

59 

57 

55 

53 

51 

65 

98 

95 

93 

90 

88 

85 

83 

80 

78 

76 

73 

71 

69 

67 

64 

62 

60 

58 

56 

54 

62 

66 

98 

95 

93 

90 

88 

85 

83 

81 

78 

76 

74 

72 

69 

67 

65 

63 

61 

59 

57 

54 

52 

67 

98 

95 

93 

90 

88 

85 

83 

81 

79 

76 

74 

72 

70 

68 

65 

63 

61 

59 

57 

55 

53 

68 

98 

95 

93 

90 

88 

86 

83 

81 

79 

77 

74 

72 

70 

68 

66 

61 

62 

60 

58 

56 

54 

69 

98 

95 

93 

91 

88 

86 

84 

81 

79 

77 

75 

73 

71 

68 

66 

64 

62 

60 

58 

56 

54 

70 

98 

95 

93 

91 

88 

86 

84 

82 

79 

77 

75 

73 

71 

69 

67 

65 

63 

61 

59 

67 

55 

71 

98 

95 

93 

91 

89 

86 

84 

82 

80 

77 

75 

73 

71 

69 

67 

65 

63 

61 

59 

57 

55 

72 

98 

95 

93 

91 

89 

86 

84 

82 

80 

78 

76 

74 

72 

70 

68 

66 

64 

62 

60 

58 

56 

73 

98 

95 

93 

91 

89 

87 

85 

82 

80 

78 

76 

74 

72 

70 

68 

66 

64 

62 

60 

59 

57 

74 

98 

95 

93 

91 

89 

87 

85 

83 

80 

78 

76 

74 

72 

70 

68 

66 

65 

63 

61 

59 

57 

75 

98 

96 

93 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

67 

65 

63 

61 

59 

58 

76 

98 

96 

93 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

67 

65 

64 

62 

60 

58 

77 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

68 

66 

64 

62 

60 

59 

78 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

75 

74 

72 

70 

68 

66 

64 

63 

61 

59 

79 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

78 

76 

74 

72 

70 

68 

67 

65 

63 

61 

60 

80 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

78 

76 

74 

72 

70 

69 

67 

65 

63 

62 

60 

69 


TABLE  VIII. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  27.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (I  —  t'}. 

temp. 
t 

11.0 

11.5 

12.0 

12.6 

13.0 

13.5 

14.0 

14.5 

15.0 

15.5 

16.0 

16.5 

17.0 

7.5 

8.0 

18.5 

9.0 

9.5 

20.0 

20.5 

21.0 

33 

3 

34 

5 

1 

35 

8 

4 

0 

36 

10 

7 

3 

37 

13 

9 

5 

2 

38 

15 

11 

8 

4 

1 

39 

17 

14 

10 

7 

3 

40 

19 

16 

13 

9 

6 

2 

41 

22 

18 

15 

12 

8 

5 

2 

42 

24 

20 

17 

14 

11 

7 

4 

1 

43 

26 

22 

19 

16 

13 

10 

7 

4 

1 

44 

27 

24 

21 

18 

15 

12 

9 

6 

3 

0 

45 

29 

26 

23 

20 

17 

14 

11 

8 

5 

2 

46 

30 

27 

24 

22 

19 

16 

13 

10 

8 

5 

2 

47 

32 

29 

26 

23 

20 

18 

15 

12 

10 

7 

4 

1 

48 

33 

30 

27 

25 

22 

19 

17 

14 

11 

9 

6 

4 

1 

49 

34 

32 

29 

26 

24 

21 

18 

16 

13 

11 

8 

6 

3 

1 

60 

35 

33 

30 

28 

25 

22 

20 

17 

15 

12 

10 

8 

5 

3 

0 

51 

37 

34 

31 

29 

26 

24 

21 

19 

17 

14 

12 

9 

7 

5 

2 

0 

52 

38 

35 

33 

30 

28 

25 

23 

21 

18 

16 

13 

11 

9 

6 

4 

2 

63 

39 

37 

34 

32 

29 

27 

24 

22 

20 

17 

15 

13 

10 

8 

6 

4 

2 

54 

40 

38 

35 

33 

30 

28 

26 

24 

21 

19 

17 

14 

12 

10 

8 

6 

3 

1 

65 

41 

39 

36 

34 

31 

29 

27 

25 

23 

20 

18 

16 

14 

12 

9 

7 

5 

3 

1 

56 

42 

40 

37 

35 

33 

30 

28 

26 

24 

22 

20 

17 

15 

13 

11 

9 

7 

5 

3 

1 

67 

43 

41 

38 

36 

34 

32 

30 

27 

25 

23 

21 

19 

17 

14 

12 

10 

8 

6 

4 

2 

0 

68 

44 

42 

39 

37 

35 

33 

31 

29 

27 

24 

22 

20 

18 

16 

14 

12 

10 

8 

6 

4 

2 

59 

46 

43 

40 

38 

36 

34 

32 

30 

28 

26 

24 

21 

19 

17 

15 

13 

11 

10 

8 

6 

4 

60 

46 

44 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

17 

15 

13 

11 

9 

7 

5 

61 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

14 

12 

11 

9 

7 

62 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

18 

16 

14 

12 

10 

8 

63 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

21 

19 

17 

15 

13 

12 

10 

64 

49 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

27 

26 

24 

22 

20 

18 

17 

15 

13 

11 

65 

50 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

27 

25 

23 

21 

19 

18 

16 

14 

12 

66 

50 

48 

46 

44 

42 

41 

39 

37 

35 

33 

31 

29 

28 

26 

24 

22 

21 

19 

17 

16 

14 

67 

51 

49 

47 

45 

43 

41 

40 

38 

36 

34 

32 

30 

29 

27 

25 

23 

22 

20 

18 

17 

15 

68 

52 

50 

48 

46 

44 

42 

40 

39 

37 

35 

33 

31 

30 

28 

26 

25 

23 

21 

20 

18 

16 

69 

52 

50 

49 

47 

45 

43 

41 

39 

38 

36 

34 

32 

31 

29 

27 

26 

24 

22 

21 

19 

17 

70 

53 

51 

49 

47 

46 

44 

42 

40 

39 

37 

35 

33 

32 

30 

28 

27 

25 

23 

22 

20 

19 

71 

54 

52 

50 

48 

46 

45 

43 

41 

39 

38 

36 

34 

32 

31 

29 

28 

26 

24 

23 

21 

20 

72 

64 

52 

50 

49 

47 

45 

44 

42 

40 

38 

37 

35 

33 

32 

30 

29 

27 

25 

24 

22 

21 

73 

55 

53 

51 

49 

48 

46 

44 

43 

41 

39 

38 

36 

34 

33 

31 

30 

28 

26 

25 

23 

22 

74 

55 

64 

52 

50 

48 

47 

45 

43 

42 

40 

38 

37 

35 

33 

32 

30 

29 

27 

26 

24 

23 

75 

56 

54 

52 

51 

49 

47 

46 

44 

42 

41 

39 

37 

36 

34 

33 

31 

30 

28 

27 

25 

24 

76 

56 

55 

53 

51 

50 

48 

46 

45 

43 

41 

40 

38 

37 

35 

34 

32 

30 

29 

27 

26 

25 

77 

57 

55 

53 

52 

50 

48 

47 

45 

44 

42 

40 

39 

37 

36 

34 

33 

31 

30 

28 

27 

25 

78 

58 

56 

54 

52 

51 

49 

47 

46 

44 

43 

41 

39 

38 

37 

35 

34 

32 

31 

29 

28 

26 

79 

58 

56 

54 

53 

51 

50 

48 

46 

45 

43 

42 

40 

39 

37 

36 

34 

33 

32 

30 

29 

27 

80 

68 

57 

55 

53 

52 

50 

49 

47 

45 

44 

42 

41 

39 

38 

36 

35 

34 

32 

31 

29 

28 

<l-f) 

t 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

59 

0 

60 

2 

61 

3 

62 

5 

1 

63 

6 

3 

64 

8 

5 

1 

65 

9 

6 

3 

66 

11 

7 

4 

1 

67 

12 

9 

6 

3 

68 

13 

10 

7 

4 

1 

69 

14 

11 

8 

5 

2 

70 

16 

13 

10 

7 

4 

1 

71 

17 

14 

11 

8 

5 

2 

72 

18 

15 

12 

9 

6 

4 

1 

73 

19 

16 

13 

10 

8 

5 

2 

74 

20 

17 

14 

12 

9 

6 

4 

1 

75 

21 

18 

15 

13 

10 

7 

5 

2 

76 

22 

19 

16 

14 

11 

9 

6 

4 

1 

77 

23 

20 

17 

15 

12 

10 

7  ' 

5 

2 

78 

21 

18 

16 

13 

11 

8 

6 

4 

1 

79 

25 

22 

19 

17 

14 

12 

9 

7 

5 

2 

0 

80 

26 

23 

20 

18 

15 

13 

10 

8 

6 

4 

1 

70 


TABLE  VIII. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  27.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t—f). 

1 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

80 

96 

92 

88 

84 

80 

76 

72 

69 

65 

G'J 

58 

55 

52 

49 

45 

42 

82 

96 

92 

88 

84 

80 

77 

73 

69 

66 

62 

59 

56 

53 

50 

47 

44 

84 

96 

92 

88 

84 

81 

77 

74 

70 

67 

63 

60 

57 

54 

51 

48 

45 

86 

96 

92 

88 

85 

81 

77 

74 

71 

67 

64 

61 

58 

55 

62 

49 

46 

88 

96 

92 

89 

85 

81 

78 

75 

71 

68 

65 

62 

59 

56 

53 

60 

47 

90 

96 

92 

89 

85 

82 

78 

75 

72 

68 

65 

62 

59 

56 

54 

51 

48 

92 

96 

92 

89 

85 

82 

79 

75 

72 

69 

66 

63 

60 

57 

54 

52 

49 

94 

96 

93 

89 

86 

82 

79 

76 

73 

69 

66 

64 

61 

58 

55 

52 

50 

96 

96 

93 

89 

86 

83 

79 

76 

73 

70 

67 

64 

61 

59 

56 

53 

51 

98 

96 

93 

90 

86 

83 

80 

77 

74 

71 

68 

65 

62 

59 

57 

54 

51 

100 

96 

93 

90 

86 

83 

80 

77 

74 

71 

68 

65 

63 

60 

57 

55 

52 

102 

97 

93 

90 

87 

83 

80 

77 

74 

71 

69 

66 

63 

61 

58 

55 

53 

104 

97 

93 

90 

87 

84 

81 

78 

75 

72 

69 

66 

64 

61 

59 

56 

54 

106 

97 

93 

90 

87 

84 

81 

78 

75 

72 

70 

67 

64 

62 

59 

57 

54 

108 

97 

93 

90 

87 

84 

81 

78 

75 

73 

70 

67 

65 

62 

60 

67 

55 

110 

97 

94 

90 

87 

84 

81 

79 

76 

73 

70 

68 

65 

63 

60 

58 

56 

112 

97 

94 

91 

88 

85 

82 

79 

76 

73 

71 

68 

66 

63 

61 

58 

56 

114 

97 

94 

91 

88 

85 

82 

79 

76 

74 

71 

69 

66 

64 

61 

59 

57 

116 

97 

94 

91 

88 

85 

82 

79 

77 

74 

71 

69 

67 

64 

62 

59 

57 

118 

97 

94 

91 

88 

85 

82 

80 

77 

74 

72 

69 

67 

65 

62 

60 

58 

120 

97 

94 

91 

88 

85 

83 

80 

77 

75 

72 

70 

67 

65 

63 

60 

58 

122 

97 

94 

91 

88 

86 

83 

80 

78 

75 

73 

70 

68 

65 

63 

61 

59 

124 

97 

94 

91 

88 

86 

83 

80 

78 

75 

73 

70 

68 

66 

63 

61 

59 

126 

97 

94 

91 

89 

86 

83 

81 

78 

76 

73 

71 

68 

66 

64 

62 

60 

128 

97 

94 

91 

89 

86 

83 

81 

78 

76 

73 

71 

69 

67 

64 

62 

60 

130 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

71 

69 

67 

65 

63 

61 

132 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

72 

69 

67 

65 

63 

61 

134 

97 

94 

9'2 

89 

86 

84 

81 

79 

77 

74 

72 

70 

68 

65 

63 

61 

136 

97 

94 

92 

89 

87 

84 

82 

79 

77 

75 

72 

70 

68 

66 

64 

62 

138 

97 

95 

92 

89 

87 

84 

82 

79 

77 

75 

73 

70 

68 

66 

64 

62 

140 

97 

95 

92 

89 

87 

84 

82 

80 

77 

75 

73 

71 

69 

66 

64 

62 

i 

Depression  of  wet-bulb  thermometer  (1  —  t'). 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

80 

39 

36 

34 

31 

28 

26 

23 

20 

18 

15 

13 

10 

8 

6 

4 

1 

82 

1  41 

38 

35 

32 

30 

27 

24 

22 

20 

17 

15 

12 

10 

8 

6 

4 

84 

42 

39 

36 

34 

31 

29 

26 

24 

21 

19 

17 

14 

12 

10 

8 

6 

86 

43 

40 

38 

35 

33 

30 

28 

25 

23 

21 

18 

16 

14 

12 

10 

8 

88 

44 

42 

39 

36 

34 

31 

29 

27 

24 

22 

20 

18 

16 

14 

12 

10 

90 

45 

43 

40 

38 

35 

33 

30 

28 

26 

24 

21 

19 

17 

15 

13 

11 

92 

46 

44 

41 

39 

36 

34 

32 

29 

27 

25 

23 

21 

19 

17 

15 

13 

94 

47 

45 

42 

40 

37 

35 

33 

31 

28 

26 

24 

22 

20 

18 

16 

15 

96 

48 

46 

43 

41 

38 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

98 

49 

46 

44 

42 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

17 

100 

50 

47 

45 

43 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

21 

19 

102 

50 

48 

46 

44 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

22 

20 

104 

51 

49 

47 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

25 

23 

21 

106 

52 

50 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

28 

26 

24 

22 

108 

53 

50 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

29 

27 

25 

23 

110 

53 

51 

49 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

28 

26 

24 

112 

54 

52 

49 

47 

45 

43 

41 

39 

38 

36 

34 

32 

30 

29 

27 

25 

114 

54 

52 

50 

48 

46 

44 

42 

40 

38 

37 

35 

33 

31 

30 

28 

26 

116 

55 

53 

51 

49 

47 

45 

43 

41 

39 

37 

36 

34 

32 

30 

29 

27 

118 

56 

53 

51 

49 

47 

45 

43 

42 

40 

38 

36 

35 

33 

31 

30 

28 

120 

56 

54 

52 

50 

48 

46 

44 

42 

40 

39 

37 

35 

34 

32 

31 

29 

122 

57 

55 

52 

50 

49 

47 

45 

43 

41 

39 

38 

36 

34 

33 

31 

30 

124 

57 

55 

53 

51 

49 

47 

45 

44 

42 

40 

38 

37 

35 

34 

32 

31 

126 

58 

56 

54 

52 

50 

48 

46 

44 

42 

41 

39 

37 

36 

34 

33 

31 

128 

58 

56 

54 

52 

50 

48 

47 

45 

43 

41 

40 

38 

37 

35 

33 

32 

130 

58 

56 

54 

53 

51 

49 

47 

45 

44 

42 

40 

39 

37 

36 

34 

33 

132 

59 

57 

55 

53 

51 

49 

48 

46 

44 

43 

41 

39 

38 

36 

35 

33 

134 

59 

57 

55 

54 

52 

50 

48 

46 

45 

43 

42 

40 

38 

37 

35 

34 

136 

60 

58 

56 

54 

52 

50 

49 

47 

45 

44 

42 

41 

39 

38 

36 

35 

138 

60 

58 

56 

54 

53 

51 

49 

47 

46 

44 

43 

41 

40 

38 

37 

35 

140 

61 

59 

57 

55 

53 

51 

50 

48 

46 

45 

43 

42 

40 

39 

37 

36 

71 


TABLE  VIII.— Relative  humidity,  per  cent— Fahrenheit  temperatures. 

Pressure==27.0  inches. 


Air 
temp. 
t 

Depression  of  wet-bulb  thermometer  (t—f). 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

46 

47 

48 

80 

82 

1 

84 

4 

2 

86 

6 

4 

2 

88 

8 

6 

4 

2 

0 

90 

9 

8 

6 

4 

2 

0 

92 

11 

9 

7 

6 

4 

2 

1 

94 

13 

11 

9 

7 

6 

4 

3 

1 

96 

14 

13 

11 

9 

7 

6 

4 

3 

1 

98 

16 

14 

12 

11 

9 

7 

6 

4 

3 

1 

100 

17 

15 

14 

12 

11 

9 

7 

6 

4 

3 

2 

0 

102 

18 

17 

15 

13 

12 

10 

9 

7 

6 

5 

3 

2 

1 

104 

20 

18 

16 

15 

13 

12 

10 

9 

7 

6 

5 

3 

2 

1 

106 

21 

19 

18 

16 

14 

13 

12 

10 

9 

7 

6 

5 

4 

2 

1 

108 

22 

20 

19 

17 

16 

14 

13 

11 

10 

9 

7 

6 

5 

4 

3 

1 

110 

23 

21 

20 

18 

17 

15 

14 

13 

11 

10 

9 

7 

6 

5 

4 

3 

112 

24 

22 

21 

19 

18 

17 

15 

14 

12 

11 

10 

9 

8 

6 

5 

4 

114 

25 

23 

22 

20 

19 

18 

16 

15 

14 

12 

11 

10 

9 

8 

6 

5 

116 

26 

24 

23 

21 

20 

19 

17 

16 

15 

13 

12 

11 

10 

9 

8 

6 

118 

27 

25 

24 

22 

21 

20 

18 

17 

16 

14 

13 

12 

11 

10 

9 

8 

120 

28 

26 

25 

23 

22 

20 

19 

18 

17 

15 

14 

13 

12 

11 

10 

9 

122 

28 

27 

25 

24 

23 

21 

20 

19 

18 

16 

15 

14 

13 

12 

11 

10 

124 

29 

28 

26 

25 

24 

22 

21 

20 

19 

17 

16 

15 

14 

13 

12 

11 

126 

30 

28 

27 

26 

24 

23 

22 

21 

19 

18 

17 

16 

15 

14 

13 

12 

128 

31 

29 

28 

26 

25 

24 

23 

21 

20 

19 

18 

17 

16 

15 

13 

12 

130 

31 

30 

29 

27 

26 

25 

23 

22 

21 

20 

19 

18 

16 

15 

14 

13 

132 

32 

31 

29 

28 

27 

25 

24 

23 

22 

21 

19 

18 

17 

16 

15 

14 

134 

33 

31 

30 

29 

27 

26 

25 

24 

22 

21 

20 

19 

18 

17 

16 

'15 

136 

33 

32 

31 

29 

28 

27 

26 

24 

23 

22 

21 

20 

19 

18 

17 

16 

138 

34 

32 

31 

30 

29 

27 

26 

25 

24 

23 

22 

21 

19 

18 

17 

16 

140 

34 

33 

32 

30 

29 

28 

27 

26 

24 

23 

22 

21 

20 

19 

18 

17 

RELATIVE   HUMIDITY. 

72 

TABLE  IX. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  25.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t—f). 

temp. 

t 

9, 

4 

8 

UJLi 

1  4 

1  fi 

1  8 

2022 

2.4 

2.6 

2.8 

3.0  3.2 

3  4 

3  6 

3  8 

4  0 

4  2 



—  40 
—39 

gg 

55 
58 
60 

8 
13 
18 

MO 

—37 

62 

22 

4.4 

4.6 

4.8 

5.0 

5.2 

5.4 

5.6 

5.8 

6.0 

6.2 

6.4 

6.6 

6.8 

7.0 

7.2 

—36 

64 

25 

6 

4 

—35 

67 

29 

7 

7 

3 

—34 

69 

33 

0 

8 

11 

7 

3 

—33 

70 

37 

6 

9 

14 

10 

7 

3 

—32 

71 

40 

12 

10 

17 

13 

10 

6 

3 

—31 

73 

43 

17 

11 

20 

17 

13 

10 

6 

3 

12 

23 

20 

16 

13 

10 

6 

3 

13 

26 

23 

19 

16 

13 

10 

6 

3 

0 

—30 

75 

46 

21 

14 

28 

25 

22 

19 

16 

13 

10 

7 

4 

1 

—29 

76 

50 

25 

15 

31 

28 

25 

22 

19 

16 

13 

10 

7 

4 

1 

—28 

78 

53 

29 

6 

16 

34 

31 

28 

25 

22 

19 

16 

13 

10 

8 

5 

2 

—27 

79 

56 

33 

11 

17 

36 

33 

30 

28 

25 

22 

19 

16 

14 

11 

8 

5 

3 

—26 

80 

58 

36 

16 

18 

38 

36 

33 

30 

27 

25 

22 

19 

17 

14 

11 

9 

6 

3 

1 

19 

40 

38 

35 

33 

30 

27 

25 

22 

20 

17 

14 

12 

9 

7 

4 

—25 
24 

81 
81 

60 
62 

40 
43 

20 
24 

1 
g 

20 

42 

40 

37 

35 

32 

30 

27 

25 

22 

20 

17 

15 

12 

10 

7 

—23 

Ol 

82 

63 

46 

28 

11 

(t-f) 

—  22 

83 

65 

49 

32 

16 

—21 

84 

67 

52 

35 

20 

3 

I 

.1 

.2 

.3 

.4 

.5 

—20 

85 

68 

54 

39 

25 

8 

—52 

56 

0 

—19 

86 

70 

56 

42 

29 

13 

—61 

58 

5 

—18 

87 

72 

59 

45 

32 

17 

4 

-50 

61 

11 

-17 

87 

73 

61 

48 

35 

21 

9 

—49 

64 

17 

—16 

88 

75 

63 

50 

38 

26 

14 

1 

—48 

66 

23 

—47 

68 

28 

—15 
—14 
-13 
—12 
-11 

89 
89 
90 
90 
91 

76 
78 
79 
80 
81 

65 
67 
69 
70 
71 

53 

56 
58 
60 
62 

42 
44 
47 
60 
52 

30 
33 
37 
40 
42 

18 
22 
26 
30 
33 

7 
11 
16 

20 
24 

0 
5 
10 
14 

0 
5 

—46 
—45 
—44 
—43 
—42 
-41 

70 
72 
74 
76 

77 
78 

33 

38 
42 
45 
49 
52 

3 
11 

18 
23 

27 

3 

—40 

78 

55 

31 

8 

—10 

91 

82 

73 

64 

55 

45 

36 

27 

18 

9 

—39 

79 

58 

34 

13 

—  9 

92 

82 

74 

65 

57 

48 

39 

31 

22 

14 

5 

—38 

80 

60 

37 

18 

—  8 

92 

83 

75 

67 

59 

50 

42 

34 

26 

18 

9 

1 

—37 

80 

62 

40 

22 

0 

7 

92 

84 

76 

68 

61 

52 

45 

37 

29 

22 

14 

6 

-  36 

81 

64 

44 

25 

6 

—  6 

93 

85 

77 

69 

62 

64 

47 

40 

32 

25 

17 

10 

3 

-35 

82 

67 

47 

29 

12 

-34 

83 

69 

50 

33 

17 

—  5 

93 

85 

78 

71 

64 

56 

49 

42 

35 

28 

21 

14 

7 

-33 

84 

70 

53 

37 

21 

—  4 
~  3 

93 
94 

86 
87 

79 
80 

72 
74 

65 
67 

58 
60 

52 
64 

45 
47 

38 
41 

31 
34 

24 
28 

18 
21 

11 

15 

4 

8 

2 

—  2 

94 

87 

81 

75 

68 

62 

56 

50 

43 

37 

31 

25 

19 

12 

6 

0 

—  1 

94 

88 

82 

76 

70 

64 

58 

52 

46 

40 

34 

28 

23 

17 

10 

5 

0 

94 

89 

83 

77 

71 

66 

60 

54 

48 

43 

37 

32 

26 

20 

15 

9 

3 

+  1 

94 

89 

84 

78 

73 

67 

62 

56 

61 

45 

40 

35 

29 

24 

19 

13 

7 

2 

2 

95 

90 

84 

79 

74 

69 

63 

58 

53 

48 

43 

38 

32 

27 

22 

17 

12 

6 

1 

3 

95 

90 

85 

80 

75 

70 

65 

60 

55 

50 

45 

40 

35 

30 

25 

21 

16 

11 

6 

1 

4 

95 

90 

85 

81 

76 

71 

66 

61 

57 

52 

47 

43 

38 

33 

28 

24 

19 

14 

10 

5 

0 

5 

95 

91 

86 

81 

77 

72 

68 

63 

58 

54 

49 

45 

40 

36 

31 

27 

22 

18 

13 

9 

4 

6 

96 

91 

87 

82 

78 

73 

69 

64 

60 

56 

51 

47 

43 

38 

34 

30 

25 

21 

17 

12 

8 

7 

96 

91 

87 

83 

78 

74 

70 

66 

61 

57 

53 

49 

45 

41 

36 

32 

28 

24 

20 

16 

11 

8 

96 

92 

88 

83 

79 

75 

71 

67 

63 

59 

55 

51 

47 

43 

39 

35 

31 

27 

23 

19 

15 

9 

96 

92 

88 

84 

80 

76 

72 

68 

64 

60 

56 

52 

48 

45 

41 

37 

33 

29 

26 

22 

18 

10 

96 

92 

88 

84 

81 

77 

73 

69 

66 

62 

58 

54 

50 

47 

43 

39 

35 

32 

28 

24 

21 

11 

96 

92 

89 

85 

81 

78 

74 

70 

67 

63 

59 

56 

52 

49 

45 

41 

38 

34 

31 

27 

24 

12 

96 

93 

89 

86 

82 

79 

75 

71 

68 

64 

61 

57 

54 

51 

47 

44 

40 

37 

33 

30 

27 

13 

97 

93 

90 

86 

83 

79 

76 

73 

69 

66 

62 

59 

56 

52 

49 

46 

42 

39 

36 

32 

29 

14 

97 

93 

90 

87 

83 

80 

77 

74 

70 

67 

64 

60 

57 

54 

51 

48 

45 

41 

38 

35 

32 

16 

97 

93 

90 

87 

84 

81 

78 

75 

71 

68 

65 

62 

59 

56 

53 

50 

47 

44 

40 

37 

34 

16 

97 

94 

91 

88 

85 

82 

79 

76 

73 

70 

67 

64 

60 

57 

54 

51 

48 

46 

43 

40 

37 

17 

97 

94 

91 

88 

85 

82 

79 

76 

74 

71 

68 

65 

62 

59 

56 

53 

50 

47 

45 

42 

39 

18 

97 

94 

91 

89 

86 

83 

80 

77 

74 

72 

69 

66 

63 

60 

58 

55 

62 

49 

47 

44 

41 

19 

97 

94 

92 

89 

86 

83 

80 

78 

75 

72 

70 

67 

64 

62 

59 

56 

54 

51 

48 

46 

43 

20 

97 

94 

92 

89 

87 

84 

81 

78 

76 

73 

71 

68 

65 

63 

60 

58 

55 

53 

50 

48 

46 

RELATIVE  HUMIDITY. 
73 

TABLE  IX. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  25. 0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

I 

0.5 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

8.5 

9.0 

9.5 

10.0 

10.5 

20 

93 

87 

80 

73 

67 

60 

54 

48 

41 

35 

28 

22 

16 

10 

4 

21 

94 

87 

80 

74 

68 

61 

55 

49 

43 

37 

31 

25 

19 

13 

7 

1 

22 

94 

87 

81 

75 

69 

62 

56 

50 

45 

39 

33 

27 

21 

15 

10 

4 

23 

94 

88 

82 

76 

70 

64 

58 

52 

46 

40 

35 

29 

24 

18 

13 

7 

2 

24 

94 

88 

82 

76' 

71 

65 

59 

53 

48 

42 

37 

31 

26 

21 

15 

10 

5 

25 

94 

88 

83 

77 

71 

66 

60 

55 

49 

44 

38 

33 

28 

23 

18 

13 

8 

3 

26 

95 

89 

83 

78 

72 

67 

61 

56 

51 

45 

40 

35 

30 

25 

20 

15 

10 

5 

1 

27 

95 

89 

84 

78 

73 

68 

63 

57 

52 

47 

42 

37 

32 

27 

22 

17 

13 

8 

3 

28 

95 

89 

84 

79 

74 

69 

64 

59 

54 

49 

44 

39 

34 

29 

25 

20 

15 

11 

6 

2 

29 

95 

90 

85 

80 

75 

70 

65 

60 

55 

50 

45 

40 

36 

31 

27 

22 

18 

13 

9 

4 

0 

30 

95 

90 

85 

80 

75 

70 

60 

61 

56 

52 

47 

42 

38 

33 

29 

24 

20 

16 

11 

7 

3 

31 

95 

90 

85 

81 

76 

71 

67 

62 

57 

53 

48 

44 

39 

35 

31 

26 

22 

18 

14 

10 

5 

32 

95 

90 

86 

81 

77 

72 

68 

63 

58 

54 

50 

45 

41 

37 

33 

28 

24 

20 

16 

12 

8 

33 

95 

91 

87 

82 

78 

73 

69 

64 

60 

56 

51 

47 

43 

39 

35 

31 

27 

23 

19 

15 

11 

34 

95 

91 

87 

83 

79 

74 

70 

65 

61 

57 

53 

49 

45 

41 

36 

32 

29 

25 

21 

17 

13 

35 

96 

92 

87 

83 

79 

75 

71 

67 

62 

58 

54 

50 

46 

42 

38 

34 

31 

27 

23 

19 

15 

36 

96 

92 

88 

84 

80 

76 

72 

68 

64 

60 

56 

52 

48 

44 

40 

36 

33 

29 

25 

21 

18 

37 

96 

92 

88 

84 

81 

77 

73 

69 

65 

61 

57 

53 

49 

46 

42 

38 

34 

31 

27 

24 

20 

38 

96 

92 

88 

84 

81 

77 

73 

69 

65 

62 

58 

55 

51 

47 

44 

40 

36 

33 

29 

26 

22 

39 

96 

92 

89 

85 

81 

77 

73 

70 

66 

63 

59 

56 

52 

49 

45 

42 

38 

34 

31 

28 

24 

40 

96 

92 

89 

85 

81 

78 

74 

70 

67 

64 

60 

57 

53 

50 

47 

43 

40 

36 

33 

29 

26 

41 

96 

93 

89 

85 

82 

79 

75 

71 

68 

64 

61 

58 

54 

61 

48 

45 

41 

38 

35 

31 

28 

42 

96 

93 

89 

86 

82 

79 

75 

72 

68 

65 

62 

59 

55 

52 

49 

46 

42 

39 

36 

33 

30 

43 

96 

93 

89 

86 

82 

79 

75 

72 

69 

66 

62 

59 

56 

53 

50 

47 

44 

41 

37 

34 

31 

44 

97 

93 

90 

86 

83 

80 

76 

73 

70 

67 

63 

60 

57 

54 

51 

48 

45 

42 

39 

36 

33 

45 

97 

93 

90 

87 

83 

80 

77 

73 

70 

67 

64 

61 

58 

55 

52 

49 

46 

43 

40 

37 

34 

46 

97 

93 

90 

87 

84 

81 

77 

74 

71 

68 

65 

62 

59 

56 

53 

50 

47 

44 

41 

38 

35 

47 

97 

93 

90 

87 

84 

81 

77 

74 

71 

68 

65 

62 

59 

57 

54 

51 

48 

45 

42 

39 

37 

48 

97 

94 

90 

87 

84 

81 

78 

75 

72 

69 

66 

63 

60 

57 

54 

52 

49 

46 

43 

40 

38 

49 

97 

94 

91 

88 

84 

81 

78 

75 

72 

69 

67 

64 

61 

58 

55 

52 

50 

47 

45 

42 

39 

50 

97 

94 

91 

88 

85 

82 

79 

76 

73 

70 

67 

64 

62 

59 

56 

53 

51 

48 

46 

43 

40 

51 

97 

94 

91 

88 

85 

82 

79 

76 

73 

71 

68 

65 

62 

60 

57 

54 

52 

49 

47 

44 

41 

52 

97 

94 

91 

88 

85 

83 

80 

77 

74 

71 

r-8 

66 

63 

60 

58 

55 

53 

50 

48 

45 

42 

53 

97 

94 

91 

88 

86 

83 

80 

77 

74 

71 

69 

66 

64 

61 

58 

56 

53 

51 

49 

46 

43 

54 

97 

94 

91 

88 

86 

83 

80 

77 

75 

72 

69 

67 

64 

62 

59 

57 

54 

52 

49 

47 

44 

55 

97 

94 

91 

89 

86 

83 

81 

78 

75 

72 

70 

67 

65 

62 

60 

57 

55 

53 

50 

48 

45 

56 

97 

94 

92 

89 

86 

83 

81 

78 

75 

73 

71 

68 

65 

63 

60 

58 

56 

53 

51 

49 

46 

57 

97 

94 

92 

89 

86 

84 

81 

78 

76 

73 

71 

68 

66 

03 

61 

59 

56 

54 

52 

49 

47 

58 

97 

95 

92 

89 

87 

84 

81 

79 

76 

74 

71 

69 

66 

64 

62 

59 

57 

55 

52 

60 

48 

59 

97 

95 

92 

90 

87 

84 

82 

79 

77 

74 

72 

69 

67 

65 

62 

60 

58 

56 

53 

51 

48 

60 

97 

95 

92 

90 

87 

85 

82 

79 

77 

74 

72 

70 

67 

65 

63 

61 

58 

56 

54 

52 

49 

61 

97 

95 

92 

90 

87 

85 

82 

80 

77 

75 

73 

70 

68 

66 

63 

61 

59 

57 

54 

52 

50 

62 

97 

05 

92 

90 

87 

85 

83 

80 

78 

75 

73 

71 

68 

66 

64 

62 

59 

57 

55 

53 

51 

63 

97 

95 

92 

90 

87 

85 

83 

80 

78 

76 

73 

71 

69 

67 

64 

62 

60 

58 

56 

54 

51 

64 

97 

95 

93 

90 

88 

85 

83 

81 

78 

76 

74 

72 

G9 

67 

65 

63 

61 

59 

56 

64 

52 

65 

98 

95 

93 

90 

88 

86 

83 

81 

79 

76 

74 

72 

70 

68 

65 

63 

61 

59 

57 

55 

53 

.  66 

98 

95 

93 

90 

88 

86 

84 

81 

79 

77 

74 

72 

70 

68 

66 

64 

62 

60 

58 

56 

54 

67 

98 

95 

93 

90 

88 

86 

84 

81 

79 

77 

75 

73 

70 

68 

66 

64 

62 

60 

58 

56 

54 

68 

98 

95 

93 

91 

88 

86 

84 

81 

79 

77 

75 

73 

71 

69 

67 

65 

63 

61 

59 

57 

65 

69 

98 

95 

93 

91 

89 

86 

84 

82 

80 

78 

75 

73 

71 

69 

67 

65 

63 

61 

59 

57 

56 

70 

98 

95 

93 

91 

89 

86 

84 

82 

80 

78 

76 

74 

72 

70 

68 

66 

64 

62 

60 

58 

56 

71 

98 

96 

93 

91 

89 

87 

85 

82 

80 

78 

76 

74 

72 

70 

68 

66 

64 

62 

60 

59 

57 

72 

98 

96 

93 

91 

89 

87 

85 

83 

80 

78 

76 

74 

72 

70 

68 

66 

65 

63 

61 

69 

57 

73 

98 

96 

93 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

67 

65 

63 

61 

60 

58 

74 

98 

96 

93 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

67 

65 

63 

62 

60 

58 

75 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

70 

68 

66 

64 

62 

60 

59 

76 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

75 

74 

72 

',0 

68 

66 

64 

62 

61 

59 

77 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

78 

76 

74 

72 

70 

68 

66 

65 

63 

61 

60 

78 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

78 

76 

74 

72 

70 

69 

67 

65 

63 

62 

60 

79 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

78 

76 

74 

72 

71 

69 

67 

66 

64 

62 

60 

80 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

78 

76 

75 

73 

71 

69 

68 

66 

64 

62 

61 

RELATIVE  HUMIDITY. 

74 

TABLE  IX. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure =25.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (<—<')• 

t 

11.0 

11.5 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

15.0 

15.5 

16.0 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

20.0 

20.5 

21.0 

31 

1 

32 

4 

0 

33 

7 

3 

34 

9 

6 

2 

35 

12 

8 

4 

1 

36 

14 

11 

7 

:{ 

37 

16 

13 

9 

6 

3 

38 

19 

15 

12 

8 

5 

2 

39 

21 

17 

14 

11 

7 

4 

1 

40 

23 

19 

16 

13 

10 

6 

3 

0 

41 

25 

21 

18 

1 

6 

12 

9 

6 

3 

42 

27 

23 

20 

17 

14 

11 

8 

5 

2 

43 

28 

25 

22 

1 

9 

16 

13 

10 

7 

4 

2 

44 

30 

27 

24 

21 

18 

15 

12 

10 

7 

4 

1 

45 

32 

29 

26 

23 

20 

17 

15 

12 

9 

6 

3 

1 

46 

33 

30 

27 

25 

22 

19 

17 

14 

11 

8 

6 

3 

0 

47 

34 

31 

29 

2 

6 

23 

21 

18 

16 

13 

10 

8 

5 

3 

0 

48 

35 

33 

30 

27 

25 

22 

20 

17 

15 

12 

10 

7 

5 

2 

49 

36 

34 

31 

29 

26 

24 

21 

19 

16 

14 

12 

9 

7 

4 

2 

60 

38 

35 

33 

30 

28 

25 

23 

20 

18 

16 

13 

11 

9 

6 

4 

2 

61 

39 

36 

34 

32 

29 

27 

24 

22 

20 

17 

15 

13 

10 

8 

6 

4 

1 

52 

40 

37 

35 

3 

3 

30 

28 

26 

23 

21 

19 

16 

14 

12 

10 

8 

5 

3 

1 

53 

41 

39 

36 

34 

32 

29 

27 

25 

22 

20 

18 

16 

14 

11 

9 

7 

5 

3 

1 

54 

42 

40 

37 

35 

33 

30 

28 

26 

24 

22 

19 

17 

15 

13 

11 

9 

7 

5 

3 

1 

55 

43 

41 

38 

36 

34 

32 

29 

27 

25 

23 

21 

19 

17 

15 

12 

10 

8 

6 

4 

2 

0 

56 

44 

42 

39 

37 

35 

33 

31 

28 

26 

24 

22 

20 

18 

16 

14 

12 

10 

8 

6 

4 

2 

57 

46 

42 

40 

3 

8 

36 

34 

32 

30 

28 

25 

23 

21 

19 

17 

15 

13 

11 

9 

8 

6 

4 

58 

46 

43 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

17 

15 

13 

11 

9 

7 

5 

59 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

14 

12 

11 

9 

7 

60 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

17 

16 

14 

12 

10 

8 

61 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

21 

19 

17 

15 

13 

12 

10 

62 

49 

47 

45 

4 

3 

41 

39 

37 

35 

33 

31 

29 

27 

25 

24 

22 

20 

18 

16 

15 

13 

11 

63 

49 

47 

45 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

25 

23 

21 

19 

18 

16 

14 

13 

64 

50 

48 

46 

44 

42 

41 

39 

37 

35 

33 

31 

30 

28 

20 

24 

22 

21 

19 

17 

16 

14 

65 

51 

49 

47 

45 

43 

41 

39 

38 

36 

34 

32 

31 

29 

27 

25 

23 

22 

20 

18 

17 

15 

66 

52 

50 

48 

46 

44 

42 

40 

38 

37 

35 

33 

31 

30 

28 

26 

24 

23 

21 

20 

18 

16 

67 

52 

50 

48 

4 

6 

45 

43 

41 

39 

38 

36 

34 

32 

31 

29 

27 

25 

24 

22 

21 

19 

18 

68 

53 

51 

49 

47 

45 

44 

42 

40 

38  |  37 

35 

33 

32 

30 

28 

26 

25 

23 

22 

20 

19 

69 

54 

52 

50 

48 

46 

44 

43 

41 

39 

37 

36 

34 

32 

31 

29 

28 

26 

24 

23 

21 

20 

70 

54 

62 

51 

49 

47 

45 

43 

42 

40 

38 

37 

35 

33 

32 

30 

28 

27 

'25 

24 

22 

21 

71 

55 

53 

51 

4 

9 

48 

46 

44 

42 

41 

39 

37 

36 

34 

33 

31 

29 

28 

26 

25 

23 

22 

72 

55 

53 

52 

5 

) 

48 

46 

45 

43 

42 

40 

38 

37 

35 

33 

32 

30 

29 

27 

26 

24 

23 

73 

56 

54 

62 

5 

0 

49 

47 

45 

44 

42 

41 

39 

37 

36 

..34 

33 

31 

30 

28 

27 

25 

24 

74 

56 

55 

53 

51 

49 

48 

46 

45 

43 

41 

40 

38 

3Y 

35 

34 

32 

30 

29 

28 

26 

25 

75 

67 

55 

53 

52 

50 

48 

47 

45 

44 

42 

40 

39 

37 

30 

34 

33 

31 

30 

28 

27 

26 

76 

57 

56 

54 

5 

2 

61 

49 

47 

46 

44 

43 

41 

40 

38 

36 

35 

33 

32 

31 

29 

28 

26 

77 

58 

56 

54 

53 

51 

50 

48 

46 

45 

43 

42 

40 

39 

37 

36 

34 

33 

31 

30 

29 

27 

78 

58 

57 

55 

5 

} 

52 

50 

48 

47 

45 

44 

42 

41 

39 

88 

36 

35 

34 

32 

31 

29 

2g 

79 

59 

57 

55 

54 

52 

51 

49 

48 

46 

44 

43 

42 

40 

39 

37 

36 

34 

33 

32 

30 

29 

80 

59 

58 

56 

64 

53 

51 

50 

48 

47 

45 

44 

42 

41 

39 

38 

36 

35 

34 

32 

31 

30 

(1-0 

(t-f) 

I 

22 

23 

24 

25 

26 

27 

28 

29 

30 

I 

22   23 

24 

25 

26 

27 

28 

29 

30 

67 

0 

70 

18   15 

12 

9 

6 

4 

1 

58 

2 

71 

19   16 

13 

10 

8 

5 

2 

59 

3 

72 

20   17 

14 

12 

9 

6 

4 

1 

73 

21   18 

15 

13 

10 

7 

5 

2 

60 

5 

1 

74 

22   19 

16 

14 

11 

9 

6 

4 

1 

61 

6 

3 

62 

8 

5 

1 

75 

23   20 

17 

15 

12 

10 

7 

6 

2 

63 

9 

6 

3 

76 

24   21 

18 

16 

13 

11 

8 

6 

4 

64 

11 

7 

4 

1 

77 

25   22 

19 

17 

14 

12 

9 

7 

5 

78 

25   23 

20 

18 

15 

13 

10 

8 

6 

65 

12 

9 

6 

3 

79 

26   24 

21 

19 

16 

14 

11 

9 

7 

66 

13 

10 

7 

4 

1 

67 

14 

8 

5 

2 

80 

27   25 

22 

20 

17 

15 

12 

10 

8 

68 

16 

13 

10 

7 

4 

1 

69 

17 

14 

11 

8 

5 

2 

, 

RELATIVE  HUMIDITY. 
75 

TABLE  IX.— Relative  humidity,  per  cent— Fahrenheit  temperatures. 

Pressure  =  25.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t  —  <'). 

t 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

80 

96 

92 

88 

84 

80 

76 

73 

69 

66 

62 

59 

56 

53 

50 

47 

44 

82 

96 

92 

88 

84 

81 

77 

73 

70 

67 

63 

60 

57 

54 

51 

48 

45 

84 

96 

92 

88 

85 

81 

77 

74 

71 

67 

64 

61 

58 

55 

52 

49 

46 

86 

96 

92 

89 

85 

81 

78 

74 

71 

68 

65 

61 

58 

55 

52 

50 

47 

88 

96 

92 

89 

85 

82 

78 

75 

72 

68 

65 

62 

59 

56 

53 

51 

48 

90 

96 

92 

89 

85 

82 

79 

75 

72 

69 

66 

63 

60 

57 

54 

51 

49 

92 

96 

93 

89 

86 

82 

79 

76 

73 

70 

66 

64 

61 

58 

55 

52 

50 

94 

96 

93 

89 

86 

83 

80 

76 

73 

70 

67 

64 

61 

58 

56 

53 

51 

96 

96 

93 

90 

86 

83 

80 

76 

73 

70 

68 

65 

62 

59 

57 

54 

51 

98 

97 

93 

90 

86 

83 

80 

77 

74 

71 

68 

65 

63 

60 

57 

55 

52 

100 

97 

93 

90 

87 

83 

80 

77 

74 

71 

69 

66 

63 

60 

58 

55 

53 

102 

97 

93 

90 

87 

84 

81 

78 

75 

72 

69 

66 

64 

61 

68 

56 

54 

104 

97 

93 

90 

87 

84 

81 

78 

75 

72 

69 

67 

64 

62 

69 

57 

54 

106 

97 

93 

90 

87 

84 

81 

78 

75 

72 

70 

67 

65 

62 

60 

57 

55 

108 

97 

94 

90 

87 

84 

81 

78 

76 

73 

70 

68 

65 

63 

60 

58 

55 

110 

97 

94 

90 

87 

84 

81 

79 

76 

73 

71 

68 

66 

63 

61 

58 

56 

112 

97 

94 

91 

88 

85 

82 

79 

76 

74 

71 

68 

66 

64 

61 

59 

57 

114 

97 

94 

91 

88 

85 

82 

79 

77 

74 

71 

69 

66 

64 

62 

69 

57 

116 

97 

94 

91 

88 

85 

82 

80 

77 

74 

72 

69 

(i7 

64 

62 

60 

58 

118 

97 

94 

91 

88 

85 

83 

80 

77 

75 

72 

70 

67 

65 

63 

60 

58 

120 

97 

94 

91 

88 

85 

83 

80 

77 

75 

72 

70 

68 

65 

63 

61 

59 

122 

97 

94 

91 

88 

86 

83 

80 

78 

75 

73 

70 

68 

66 

63 

61 

69 

124 

97 

94 

91 

88 

£6 

83 

81 

78 

75 

73 

71 

68 

66 

64 

62 

60 

126 

97 

94 

91 

89 

86 

83 

81 

78 

76 

73 

71 

69 

66 

64 

62 

60 

128 

97 

94 

91 

89 

86 

83 

81 

78 

76 

74 

71 

69 

67 

65 

62 

60 

130 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

72 

69 

67 

65 

63 

61 

132 

97 

94 

92 

89 

86 

84 

81 

79 

77 

74 

72 

70 

67 

65 

63 

61 

134 

97 

94 

92 

89 

87 

84 

82 

79 

77 

74 

72 

70 

68 

66 

64 

62 

136 

97 

95 

92 

89 

87 

84 

82 

79 

77 

75 

72 

70 

68 

66 

64 

62 

138 

97 

95 

92 

89 

87 

84 

82 

80 

77 

75 

73 

71 

68 

66 

64 

62 

140 

97 

95 

92 

89 

87 

85 

82 

80 

77 

75 

73 

71 

69 

67 

65 

63 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

t 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

80 

41 

38 

35 

32 

30 

27 

25 

22 

20 

17 

15 

12 

10 

8 

6 

4 

82 

42 

39 

37 

34 

31 

29 

26 

24 

21 

19 

17 

14 

12 

10 

8 

8 

84 

43 

40 

38 

35 

32 

30 

28 

25 

23 

21 

18 

16 

14 

12 

10 

8 

86 

44 

41 

39 

36 

34 

31 

29 

27 

24 

22 

20 

18 

16 

14 

12 

10 

88 

45 

43 

40 

38 

35 

33 

30 

28 

26 

24 

21 

19 

17 

15 

13 

11 

90 

46 

44 

41 

39 

36 

34 

32 

29 

27 

25 

23 

21 

19 

17 

15 

13 

92 

47 

45 

42 

40 

37 

35 

33 

31 

28 

26 

24 

22 

20 

18 

16 

15 

94 

48 

46 

43 

41 

38 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

96 

49 

46 

44 

42 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

17 

98 

50 

47 

45 

43 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

21 

19 

100 

50 

48 

46 

43 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

22 

20 

102 

51 

49 

47 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

25 

23 

21 

104 

52 

50 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

27 

26 

24 

22 

106 

52 

50 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

27 

25 

23 

108 

63 

51 

49 

47 

45 

42 

40 

38 

37 

35 

33 

31 

29 

28 

26 

24 

110 

54 

51 

49 

47 

45 

43 

41 

39 

37 

35 

34 

32 

30 

29 

27 

25 

112 

54 

52 

50 

48 

46 

44 

42 

40 

38 

36 

35 

33 

31 

30 

28 

26 

114 

55 

53 

51 

49 

47 

45 

43 

41 

39 

37 

35 

34 

32 

30 

29 

27 

116 

55 

53 

51 

49 

47 

45 

43 

42 

40 

38 

36 

34 

33 

31 

30 

28 

118 

56 

54 

52 

50 

48 

46 

44 

42 

40 

39 

37 

35 

34 

32 

30 

29 

120 

56 

54 

52 

50 

48 

47 

45 

43 

41 

39 

38 

36 

34 

33 

31 

30 

122 

67 

55 

53 

51 

49 

47 

45 

43 

42 

40 

38 

37 

35 

33 

32 

30 

124 

58 

55 

53 

51 

50 

48 

46 

44 

42 

41 

39 

37 

36 

34 

33 

31 

126 

58 

56 

54 

52 

50 

48 

46 

45 

43 

41 

40 

38 

36 

35 

33 

32 

128 

58 

56 

54 

52 

51 

49 

47 

45 

44 

42 

40 

39 

37 

36 

34 

33 

130 

59 

57 

55 

53 

51 

49 

47 

46 

14 

42 

41 

39 

38 

36 

35 

33 

132 

59 

57 

55 

53 

52 

50 

48 

46 

45 

43 

-11 

40 

38 

37 

35 

34 

134 

60 

58 

56 

54 

52 

50 

48 

47 

45 

44 

42 

40 

39 

37 

36 

34 

136 

60 

58 

66 

54 

52 

51 

49 

47 

46 

44 

42 

41 

39 

38 

36 

35 

138 

60 

58 

57 

55 

53 

51 

49 

48 

46 

45 

43 

41 

40 

39 

37 

36 

140 

61 

59 

57 

55 

53 

52 

50 

48 

47 

45 

43 

42 

40 

39 

38 

36 

76 


TABLE  IX. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  25.0  inches. 


Air 
temp. 
t 

Depression  of  wet-bulb  thermometer  (<  —  <')• 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

46 

47 

48 

80 

2 

82 

4 

2 

84 

6 

4 

2 

0 

86 

8 

6 

4 

2 

0 

88 

9 

8 

6 

4 

2 

1 

90 

11 

9 

8 

6 

4 

2 

1 

92 

13 

11 

9 

8 

6 

4 

3 

1 

94 

14 

13 

11 

9 

8 

6 

4 

3 

1 

96 

16 

14 

12 

11 

9 

7 

6 

4 

3 

2 

0 

98 

17 

15 

14 

12 

11 

9 

7 

6 

5 

3 

2 

0 

100 

18 

17 

15 

13 

12 

10 

9 

8 

6 

5 

3 

2 

1 

102 

20 

18 

16 

15 

13 

12 

10 

9 

8 

6 

5 

3 

2 

1 

7.04 

21 

19 

18 

16 

14 

13 

12 

10 

9 

8 

6 

5 

4 

2 

1 

0 

106 

22 

20 

19 

17 

16 

14 

13 

11 

10 

9 

8 

6 

5 

4 

3 

1 

108 

23 

21 

20 

18 

17 

15 

14 

13 

11 

10 

9 

8 

6 

5 

4 

3 

110 

24 

22 

21 

19 

18 

17 

15 

14 

12 

11 

10 

9 

8 

6 

5 

4 

112 

25 

23 

22 

20 

19 

18 

16 

15 

14 

12 

11 

10 

9 

8 

6 

5 

114 

26 

24 

23 

21 

20 

19 

17 

16 

15 

13 

12 

11 

10 

9 

8 

7 

116 

27 

25 

24 

22 

21 

20 

18 

17 

16 

14 

13 

12 

11 

10 

9 

8 

118 

27 

26 

25 

23 

22 

20 

19 

18 

17 

15 

14 

13 

12 

11 

10 

9 

120 

28 

27 

25 

24 

23 

21 

20 

19 

18 

16 

15 

14 

13 

12 

11 

10 

122 

29 

28 

26 

25 

23 

22 

21 

20 

18 

17 

16 

15 

14 

13 

12 

11 

124 

30 

28 

27 

26 

24 

23 

22 

20 

19 

18 

17 

16 

15 

14 

13 

12 

126 

30 

29 

28 

26 

25 

24 

23 

21 

20 

19 

18 

17 

16 

15 

13 

12 

128 

31 

30 

28 

27 

26 

25 

23 

22 

21 

20 

19 

17 

16 

15 

14 

13 

130 

32 

30 

29 

28 

26 

25 

24 

23 

22 

20 

19 

18 

17 

16 

15 

14 

132 

32 

31 

30 

28 

27 

26 

25 

24 

22 

21 

20 

19 

18 

17 

16 

15 

134 

33 

32 

30 

29 

28 

27 

25 

24 

23 

22 

21 

20 

19 

18 

17 

16 

136 

34 

32 

31 

30 

29 

27 

26 

25 

24 

23 

22 

20 

19 

18 

17 

16 

138 

34 

33 

32 

30 

29 

28 

27 

26 

24 

23 

22 

21 

20 

19 

18 

17 

140 

35 

34 

32 

31 

30 

29 

27 

26 

25 

24 

23 

22 

21 

20 

19 

18 

RELATIVE   HUMIDITY. 

77 
TABLE  X. — Relative  humidity,  per  cent — Fahrenheit  temperature. 

Pressure =23. 0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

temp. 
t 

9 

4 

.6 

8 

1  0 

1.2 

1  4 

1  6 

1  8 

20  2.  2 

?  4 

2.6 

2.8 

3.  0  3.  2 

3.4 

3.6 

3.8 

4.0 

4.2 

—40 

59 

16 

—39 

61 

21 

J 

(t-f) 

—  38 
—37 

Ofi 

62 
64 
66 

28 
31 

4.4 

4.6 

4.8 

5.0 

5.2 

5.4 

5.6 

5.8 

6.0 

6.2 

6.4 

6.6 

6.8 

7.0 

——GO 

4 

2 

—35 

68 

35 

4 

5 

6 

2 

—34 

70 

39 

9 

6 

10 

6 

2 

—  33 

72 

42 

14 

7 

13 

9 

6 

2 

—  32 

73 

45 

18 

8 

16 

13 

9 

5 

2 

31 

74 

48 

22 

9 

19 

16 

12 

9 

5 

2 

10 

22 

19 

15 

12 

9 

5 

2 

11 

25 

22 

18 

15 

12 

8 

5 

2 

—30 

76 

51 

26 

1 

12 

27 

24 

21 

18 

15 

12 

9 

6 

2 

—29 

77 

54 

30 

6 

13 

30 

27 

24 

21 

18 

15 

12 

9 

6 

3 

0 

—28 

79 

57 

34 

12 

14 

33 

30 

27 

24 

21 

18 

15 

12 

9 

6 

3 

1 

—27 

80 

59 

37 

18 

15 

35 

32 

30 

27 

24 

21 

18 

15 

12 

10 

7 

4 

1 

—26 

81 

62 

40 

22 

2 

16 

38 

35 

32 

29 

26 

24 

21 

18 

15 

13 

10 

7 

5 

2 

17 

40 

37 

34 

32 

29 

26 

24 

21 

19 

16 

13 

11 

8 

5 

—25 
—24 
—23 

82 
82 
83 

64 
65 
66 

44 
47 

50 

26 
30 
34 

8 
13 
18 

0 

18 
19 
20 

42 
44 
45 

39 
41 
43 

37 
39 
41 

34 

36 
38 

32 
34 
36 

29 
31 
33 

26 
29 
31 

24 
26 
29 

21 

24 
26 

19 
21 
24 

16 
19 
22 

14 
17 
19 

11 
14 
17 

9 
12 
15 

—22 
—21 

84 
85 

68 
70 

53 
55 

37 
40 

22 
26 

10 

(t-f) 

—20 

86 

71 

57 

44 

30 

15 

on 

2 

t 

1 

2 

s 

.4 

5 

—  19 
—18 

86 
87 

73 
74 

59 
62 

47 
50 

34 
37 

ZA) 

24 

6 

11 

—52 

56 

11 

—17 

88 

75 

63 

52 

40 

27 

16 

3 

—51 

58 

16 

—16 

89 

77 

65 

54 

43 

31 

20 

8 

—50 

61 

21 

—49 

64 

27 

48 

66 

32 

—15 
—14 
—13 
—12 

89 
90 
90 
90 

78 
79 
80 
81 

67 
69 
71 

72 

57 
59 
61 
63 

46 
48 
51 
53 

35 
38 
41 
44 

24 
28 
31 
35 

13 
17 

22 
26 

2 
7 
12 
16 

2 
7 

—47 
-46 
-45 
44 

68 
70 
72 
74 

36 
41 

45 
48 

0 
4 
10 
19 

—11 

91 

82 

73 

64 

56 

47 

38 

29 

20 

11 

2 

—43 

76 

51 

24 

0 

-42 

77 

54 

29 

5 

—10 

92 

83 

75 

66 

58 

50 

41 

32 

24 

16 

7 

—41 

78 

57 

32 

10 

__  __  Q 

92 

84 

76 

68 

60 

52 

44 

36 

28 

20 

12 

4 

—40 

78 

59 

36 

16 

—  8 

92 

85 

77 

69 

62 

54 

46 

38 

31 

23 

16 

8 

0 

—39 

79 

61 

39 

21 

_nm  "T 

93 

85 

78 

70 

63 

56 

49 

41 

34 

27 

20 

12 

5 

—38 

80 

62 

41 

25 

2 

—  6 

93 

86 

79 

72 

65 

58 

51 

44 

37 

30 

23 

16 

9 

3 

—37 

80 

64 

43 

28 

7 

-36 

81 

66 

48 

31 

13 

—  5 
_  4 

93 
93 

86 

87 

80 
81 

73 

74 

66 
68 

59 
61 

53 
55 

46 

49 

40 
42 

33 
36 

26 
30 

20 
23 

13 
17 

7 
10 

4 

—  3 

94 

88 

82 

75 

69 

63 

57 

51 

45 

39 

33 

27 

21 

14 

9 

2 

—  2 

94 

88 

82 

76 

70 

65 

59 

53 

47 

41 

36 

30 

24 

18 

12 

7 

1 

—  1 

94 

89 

83 

77 

72 

66 

61 

55 

50 

44 

39 

33 

28 

22 

16 

11 

6 

0 

o 

95 

89 

84 

79 

73 

68 

62 

57 

52 

47 

41 

36 

31 

26 

20 

15 

10 

5 

95 

90 

85 

80 

74 

69 

64 

59 

54 

49 

44 

39 

34 

29 

24 

19 

14 

9 

4 

2 
3 
4 

95 
95 
95 

90 
91 
91 

85 
86 
86 

81 

81 
82 

76 

77 

77 

71 

72 
73 

66 
67 
69 

61 
63 
64 

56 
58 
60 

51 
53 
55 

47 
49 
51 

42 
44 
46 

37 
40 
42 

32 
35 
38 

27 
30 
33 

22 
26 

29 

18 
21 
24 

13 
17 
20 

8 
12 
16 

3 
7 
11 

3 

7 

5 
6 

7 
8 
9 

96 
96 
96 
J6 
96 

91 
91 
92 
92 

92 

87 
87 
88 
88 
89 

82 
83 
84 
84 
85 

78 
79 
80 
80 
81 

74 
75 
76 
76 
77 

70 
71 

72 
73 
74 

65 

66 
68 
69 
70 

61 
62 
64 
65 
66 

57 
58 
60 
61 
63 

53 
54 
56 
58 
59 

48 
50 
52 
54 
55 

44 

46 
48 
50 
52 

40 
42 
44 

46 
48 

36 
38 
40 
42 
44 

31 
34 
36 
39 
41 

27 
30 
32 
35 
37 

23 
26 
29 
31 
34 

19 
22 
25 
28 
30 

15 

18 
21 

24 
27 

10 
14 
17 
20 
23 

10 
11 
12 
13 
14 

96 
96 
97 
97 

97 

93 
93 
93 
93 
94 

89 
89 
90 
90 
91 

85 
86 
86 
87 
87 

82 
82 
83 
84 
84 

78 
79 
80 
81 
81 

74 

75 
76 

77 
78 

71 
72 
73 
74 
75 

68 
69 
70 
71 

72 

64 

65 
66 
68 
69 

61 

62 
63 
64 
66 

57 
58 
60 
61 
63 

53 

55 
57 
58 
60 

50 
52 
53 
55 
57 

46 
48 
50 
52 
54 

43 
45 
47 
49 
51 

39 
41 
43 

46 

48 

36 
38 
40 
42 
45 

32 
35 
37 
39 
42 

29 
32 
34 
36 
39 

26 
28 
31 
33 
36 

15 
16 
17 

18 
19 

97 

97 
97 
97 
97 

94 
94 
94 
95 
95 

91 
91 
92 
92 
92 

88 
88 
89 
89 
89 

85 
85 
86 
86 
87 

82 
83 
83 
84 
84 

79 
80 
81 
81 

82 

76 
77 
78 
79 
79 

73 
74 

75 
76 

77 

70 
71 

72 
73 
74 

67 
68 
69 
71 
71 

64 
66 
67 
68 
69 

61 
63 
64 
65 
66 

58 
60 
61 
63 
64 

55 
57 
59 
60 
61 

52 
54 
56 
57 
59 

50 
51 
53 
55 
56 

47 
49 
50 
52 
54 

44 
46 

48 
50 
51 

41 
43 
45 
47 
49 

38 
40 
42 
44 
46 

20 

97 

95 

92 

90 

87 

85 

8-2 

80 

77 

75 

72 

70 

67 

65 

63 

60 

57 

55 

53 

60 

48 

RELATIVE   HUMIDITY. 

'  78 

TABLE  X. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure =23.0  inches. 


Air 
temp. 
t 

Depression  of  wet-bulb  thermometer  (t—f) 

.5 

1.0 

1.6 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

8.5 

9.0 

9.5 

10.0 

10.5 

20 

94 

87 

81 

75 

69 

63 

56 

50 

44 

38 

32 

26 

21 

15 

9 

3 

21 

94 

87 

81 

75 

69 

63 

57 

52 

46 

40 

34 

29 

23 

17 

12 

6 

1 

22 

94 

88 

82 

76 

70 

64 

59 

53 

47 

42 

36 

31 

25 

20 

15 

9 

4 

23 

94 

88 

82 

77 

71 

65 

60 

54 

49 

43 

38 

33 

28 

22 

17 

12 

7 

2 

24 

94 

89 

83 

78 

72 

67 

61 

56 

50 

45 

40 

35 

30 

25 

20 

15 

10 

5 

25 

95 

89 

84 

78 

73 

68 

62 

57 

52 

47 

42 

37 

32 

27 

22 

17 

12 

8 

3 

26 

95 

89 

84 

79 

73 

68 

63 

58 

53 

48 

43 

38 

34 

29 

24 

19 

15 

10 

6 

1 

27 

95 

90 

84 

79 

74 

69 

64 

59 

55 

50 

45 

40 

35 

31 

26 

22 

17 

13 

8 

4 

28 

95 

90 

85 

80 

75 

70 

65 

60 

5o 

51 

46 

42 

37 

33 

28 

24 

19 

15 

11 

6 

2 

29 

95 

90 

85 

80 

76 

71 

66 

62 

57 

52 

48 

43 

39 

35 

30 

26 

22 

17 

13 

9 

5 

30 

95 

90 

86 

81 

76 

72 

67 

63 

58 

54 

49 

45 

41 

36 

32 

28 

24 

20 

16 

11 

7 

31 

95 

91 

86 

81 

77 

72 

68 

64 

59 

55 

51 

46 

42 

38 

34 

3(1 

26 

22 

18 

14 

10 

32 

95 

91 

86 

82 

77 

73 

69 

65 

60 

56 

52 

48 

44 

40 

36 

32 

28 

24 

20 

16 

12 

33 

96 

92 

87 

83 

78 

74 

70 

60 

6" 

57 

53 

49 

45 

41 

38 

34 

30 

26 

22 

18 

15 

34 

96 

92 

88 

84 

79 

75 

71 

67 

63 

59 

55 

51 

47 

43 

39 

35 

32 

28 

24 

21 

17 

35 

96 

92 

88 

84 

80 

76 

72 

68 

64 

60 

56 

52 

49 

45 

41 

37 

34 

30 

26 

23 

19 

36 

96 

92 

88 

84 

80 

77 

73 

69 

65 

61 

58 

54 

50 

46 

43 

39 

35 

32 

28 

25 

21 

37 

96 

93 

89 

85 

81 

78 

74 

70 

66 

63 

59 

55 

52 

48 

44 

41 

37 

34 

30 

27 

23 

38 

96 

93 

89 

85 

81 

78 

74 

71 

67 

64 

60 

57 

53 

49 

46 

42 

39 

36 

32 

29 

25 

39 

96 

93 

89 

85 

81 

78 

75 

71 

68 

65 

61 

57 

54 

51 

48 

44 

41 

37 

34 

31 

27 

40 

96 

93 

89 

85 

82 

79 

75 

72 

68 

65 

62 

.58 

55 

52 

49 

45 

42 

39 

36 

32 

29 

41 

96 

93 

89 

86 

82 

79 

76 

72 

69 

66 

62 

59 

56 

53 

50 

47 

44 

41 

37 

34 

31 

42 

96 

93 

89 

86 

83 

80 

76 

73 

70 

67 

63 

60 

57 

54 

51 

48 

45 

42 

39 

36 

33 

43 

96 

93 

90 

87 

83 

80 

77 

73 

70 

67 

64 

61 

58 

55 

52 

49 

46 

43 

40 

37 

34 

44 

97 

94 

90 

87 

83 

80 

77 

74 

71 

68 

65 

62 

59 

56 

53 

50 

47 

44 

41 

39 

36 

45 

97 

94 

90 

87 

84 

81 

78 

74 

71 

68 

65 

62 

60 

57 

54 

51 

48 

45 

42 

40 

37 

46 

97 

94 

90 

87 

84 

81 

78 

75 

72 

69 

66 

63 

60 

57 

55 

52 

49 

46 

44 

41 

38 

47 

97 

94 

90 

87 

84 

81 

78 

75 

72 

70 

67 

64 

61 

58 

55 

53 

50 

47 

45 

42 

39 

48 

97 

94 

91 

88 

85 

82 

79 

76 

73 

70 

67 

65 

62 

59 

56 

54 

51 

48 

46 

43 

40 

49 

97 

94 

91 

88 

85 

82 

79 

76 

73 

71 

68 

65 

62 

60 

57 

54 

52 

49 

47 

44 

41 

50 

97 

94 

91 

88 

85 

82 

79 

77 

74 

71 

68 

66 

63 

60 

57 

55 

52 

50 

48 

45 

42 

51 

97 

94 

91 

88 

86 

83 

80 

77 

75 

72 

69 

66 

64 

61 

58 

56 

53 

51 

49 

46 

43 

52 

97 

94 

91 

89 

86 

83 

80 

78 

75 

72 

70 

67 

64 

61 

59 

57 

54 

52 

49 

47 

44 

53 

97 

94 

91 

89 

86 

83 

80 

78 

75 

72 

70 

67 

65 

62 

60 

57 

55 

52 

50 

48 

45 

54 

97 

94 

92 

89 

86 

83 

81 

78 

76 

73 

70 

68 

65 

63 

60 

58 

56 

53 

51 

48 

46 

55 

97 

95 

92 

89 

86 

84 

81 

78 

76 

73 

71 

69 

66 

63 

61 

59 

56 

54 

52 

49 

47 

56 

97 

95 

92 

89 

87 

84 

81 

79 

76 

74 

71 

69 

67 

64 

62 

59 

57 

55 

52 

50 

48 

57 

97 

95 

82 

89 

87 

84 

82 

79 

77 

74 

72 

69 

67 

65 

62 

60 

57 

55 

53 

51 

49 

58 

97 

95 

92 

89 

87 

84 

82 

79 

77 

74 

72 

70 

67 

65 

63 

61 

58 

56 

54 

52 

50 

59 

97 

95 

92 

90 

87 

85 

82 

80 

77 

75 

73 

70 

68 

65 

63 

61 

59 

57 

55 

53 

50 

60 

97 

95 

92 

90 

87 

85 

82 

80 

78 

75 

73 

71 

68 

66 

64 

62 

59 

57 

55 

53 

51 

61 

97 

95 

92 

90 

88 

85 

83 

80 

78 

70 

73 

71 

69 

67 

64 

62 

60 

58 

56 

54 

52 

62 

97 

95 

92 

90 

88 

85 

83 

81 

78 

76 

74 

72 

69 

67 

65 

63 

61 

59 

56 

54 

52 

63 

97 

95 

93 

90 

88 

85 

83 

81 

79 

76 

74 

72 

70 

67 

65 

63 

61 

59 

57 

55 

53 

64 

97 

95 

93 

90 

88 

86 

83 

81 

79 

77 

74 

72 

70 

68 

66 

64 

62 

60 

58 

56 

54 

65 

98 

95 

93 

91 

88 

86 

84 

81 

79 

77 

75 

73 

71 

69 

66 

«4 

62 

60 

58 

56 

54 

66 

98 

95 

93 

9t 

88 

86 

84 

82 

79 

77 

75 

73 

71 

69 

67 

65 

63 

61 

59 

57 

55 

67 

98 

95 

93 

91 

89 

86 

84 

82 

80 

77 

75 

73 

71 

69 

67 

65 

63 

61 

59 

57 

55 

68 

98 

95 

93 

91 

89 

86 

84 

82 

80 

78 

76 

74 

72 

70 

68 

66 

64 

62 

60 

58 

56 

69 

98 

96 

93 

91 

89 

87 

84 

82 

80 

78 

76 

74 

72 

70 

68 

66 

64 

62 

60 

58 

57 

70 

98 

96 

93 

91 

89 

87 

85 

83 

80 

78 

76 

74 

72 

70 

68 

66 

64 

63 

61 

59 

57 

71 

98 

96 

93 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

67 

65 

63 

61 

59 

58 

72 

98 

96 

93 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

69 

67 

65 

64 

62 

60 

58 

73 

98 

96 

93 

91 

89 

87 

85 

83 

81 

79 

77 

75 

73 

71 

70 

68 

66 

64 

62 

60 

59 

74 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

75 

74 

72 

70 

68 

66 

64 

63 

61 

59 

75 

98 

96 

94 

91 

89 

87 

85 

83 

81 

80 

78 

76 

74 

72 

70 

68 

66 

65 

63 

61 

60 

76 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

78 

76 

74 

72 

70 

69 

67 

65 

63 

62 

60 

77 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

78 

76 

74 

72 

71 

69 

67 

66 

64 

62 

60 

78 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

78 

76 

75 

73 

71 

69 

68 

66 

64 

62 

61 

79 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

78 

77 

75 

73 

71 

70 

68 

66 

65 

63 

61 

80 

98 

96 

94 

92 

90 

88 

86 

84 

82 

80 

79 

77 

75 

73 

72 

70 

68 

67 

65 

63 

62 

RELATIVE   HUMIDITY. 

79 

TABLE  X.— Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  23.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (<—<')• 

temp. 
t 

11.0 

11.5 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

15.0 

15.5 

16.0 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

20.0 

20.5 

21.0 

29 

1 

30 

4 

31 

6 

2 

se 

9 

5 

1 

33 

11 

7 

4 

0 

34 

13 

10 

6 

3 

35 

16 

12 

9 

5 

2 

36 

18 

15 

11 

8 

4 

1 

37 

20 

17 

13 

10 

7 

4 

0 

38 

22 

19 

16 

12 

9 

6 

3 

39 

24 

21 

18 

15 

12 

8 

5 

2 

40 

26 

23 

20 

17 

14 

11 

8 

5 

2 

41 

28 

25 

22 

19 

16 

13 

10 

7 

4 

1 

42 

30 

27 

24 

21 

18 

15 

12 

9 

6 

3 

1 

43 

31 

28 

26 

23 

20 

17 

14 

11 

8 

6 

3 

0 

44 

33 

30 

27 

25 

22 

19 

16 

13 

11 

8 

5 

3 

0 

45 

34 

31 

28 

26 

24 

21 

18 

15 

13 

10 

7 

5 

2 

46 

35 

33 

30 

27 

25 

22 

20 

17 

15 

12 

9 

7 

4 

2 

47 

37 

34 

31 

29 

26 

24 

21 

19 

17 

14 

11 

9 

6 

4 

2 

48 

38 

35 

32 

30 

28 

25 

23 

21 

18 

16 

13 

11 

9 

6 

4 

1 

49 

39 

37 

34 

31 

29 

27 

24 

22 

20 

17 

15 

13 

10 

8 

6 

3 

1 

50 

40 

38 

35 

33 

30 

28 

26 

23 

21 

19 

17 

14 

12 

10 

8 

5 

3 

1 

51 

41 

39 

36 

34 

32 

29 

27 

25 

23 

20 

18 

16 

14 

12 

9 

7 

5 

3 

1 

52 

42 

40 

37 

35 

33 

31 

28 

26 

24 

22 

20 

17 

15 

13 

11 

9 

7 

5 

3. 

1 

53 

43 

41 

38 

36 

34 

32 

29 

27 

25 

23 

21 

19 

17 

15 

13 

11 

9 

7 

5 

3 

1 

54 

44 

42 

39 

37 

35 

33 

31 

29 

26 

24 

22 

20 

18 

16 

14 

12 

10 

8 

6 

4 

2 

55 

45 

43 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

14 

12 

10 

8 

6 

4 

56 

46 

44 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

17 

15 

13 

11 

9 

7 

6 

57 

47 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

14 

13 

11 

9 

7 

58 

48 

45 

43 

41 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

20 

18 

16 

14 

12 

10 

9 

59 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

-26 

24 

22 

21 

19 

17 

15 

14 

12 

10 

60 

49 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

27 

26 

24 

22 

20 

18 

16 

15 

13 

11 

61 

50 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

29 

27 

25 

23 

21 

20 

18 

16 

14 

13 

62 

50 

48 

46 

45 

43 

41 

39 

37 

35 

33 

31 

30 

28 

26 

24 

23 

SJl 

19 

17 

16 

14 

63 

51 

49 

47 

45 

43 

41 

40 

38 

36 

34 

32 

31 

29 

27 

25 

24 

22 

20 

19 

17 

15 

64 

52 

50 

48 

46 

44 

42 

40 

39 

37 

35 

33 

32 

30 

28 

26 

25 

23 

21 

20 

18 

16 

65 

52 

50 

49 

47 

45 

43 

41 

39 

38 

36 

34 

32 

31 

29 

27 

26 

24 

22 

21 

19 

18 

66 

53 

61 

49 

47 

46 

44 

42 

40 

38 

37 

35 

33 

32 

30 

28 

27 

25 

24 

22 

20 

19 

67 

54 

52 

50 

48 

46 

44 

43 

41 

39 

37 

36 

34 

33 

31 

29 

28 

26 

25 

23 

21 

20 

68 

54 

52 

50 

49 

47 

45 

44 

42 

40 

38 

37 

35 

33 

32 

30 

29 

27 

25 

24 

22 

21 

69 

55 

53 

51 

49 

48 

46 

44 

42 

41 

39 

37 

36 

34 

33 

31 

30 

28 

26 

25 

23 

22 

70 

55 

53 

52 

50 

48 

47 

45 

43 

42 

40 

38 

37 

35 

33 

32 

30 

29 

27 

26 

24 

23 

71 

56 

54 

52 

51 

49 

47 

46 

44 

42 

41 

39 

37 

36 

34 

33 

31 

30 

28 

27 

25 

24 

72 

56 

55 

53 

51 

50 

48 

46 

45 

43 

41 

40 

38 

37 

35 

34 

32 

31 

29 

28 

26 

25 

73 

57 

55 

53 

52 

50 

48 

47 

45 

44 

42 

40 

39 

37 

36 

34 

33 

31 

30 

29 

27 

26 

74 

57 

56 

54 

52 

51 

49 

47 

46 

44 

43 

41 

39 

38 

37 

35 

34 

32 

31 

29 

28 

27 

75 

58 

56 

55 

53 

51 

50 

48 

46 

45 

43 

42 

40 

39 

37 

36 

34 

33 

32 

30 

29 

27 

76 

58 

57 

55 

53 

52 

50 

49 

47 

45 

44 

42 

41 

39 

38 

37 

35 

34 

32 

31 

29 

28 

77 

59 

57 

55 

54 

52 

51 

49 

48 

46 

44 

43 

41 

40 

39 

37 

36 

34 

33 

32 

30 

29 

78 

59 

57 

56 

54 

53 

51 

50 

48 

47 

45 

44 

42 

41 

39 

38 

36 

35 

34 

32 

31 

2£ 

79 

60 

58 

56 

55 

53 

52 

50 

49 

47 

46 

44 

43 

41 

40 

39 

37 

36 

34 

33 

32 

3C 

80 

60 

58 

57 

55 

54 

52 

51 

49 

48 

46 

45 

43 

42 

41 

39 

38 

37 

35 

34 

33 

31 

(<-<') 

t 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

33 

34 

60 

8 

5 

1 

61 

9 

6 

3 

62 

11 

8 

4 

1 

63 

12 

9 

6 

3 

64 

13 

10 

7 

4 

1 

65 

15 

12 

9 

6 

3 

66 

16 

13 

10 

7 

4 

1 

67 

17 

14 

11 

8 

5 

3 

68 

18 

15 

12 

9 

7 

4 

1 

69 

19 

16 

13 

11 

8 

5 

3 

0 

70 

20 

17 

14 

12 

9 

6 

4 

1 

71 

21 

18 

15 

13 

10 

8 

5 

3 

0 

72 

22 

19 

16 

14 

11 

9 

6 

4 

1 

73 

23 

20 

17 

15 

12 

10 

7 

5 

3 

0 

74 

24 

21 

-18 

16 

13 

11 

9 

6 

4 

2 

75 

25 

22 

19 

17 

14 

12 

10 

7 

5 

3 

1 

76 

25 

23 

20 

18 

15 

13 

11 

8 

6 

4 

2 

77 

26 

24 

21 

19 

16 

14 

12 

9 

7 

5 

3 

1 

78 

27 

25 

22 

20 

17 

15 

13 

10 

8 

6 

4 

2 

79 

28 

25 

23 

21 

18 

16 

14 

11 

9 

7 

5 

3 

1 

80 

29 

26 

24 

21 

19 

17 

15 

12 

10 

8 

6 

4 

2 

RELATIVE   HUMIDITY. 
80 

TABLE  X. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  23.0  inches. 


Air 

Depression  of  wet-bulb  thermometer  (t—f). 

temp. 
I 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

80 

96 

92 

88 

84 

80 

77 

73 

70 

67 

63 

60 

57 

54 

51 

48 

45 

82 

96 

92 

88 

85 

81 

77 

74 

71 

67 

64 

61 

58 

55 

52 

49 

46 

84 

96 

92 

89 

85 

81 

78 

74 

71 

68 

65 

61 

58 

55 

53 

50 

47 

86 

96 

92 

89 

85 

81 

78 

75 

71 

68 

65 

62 

59 

56 

53 

50 

48 

88 

96 

93 

89 

85 

82 

79 

75 

72 

69 

66 

63 

60 

57 

54 

51 

49 

90 

96 

93 

89 

86 

82 

79 

76 

73 

69 

66 

63 

61 

58 

55 

52 

50 

92 

96 

93 

89 

86 

83 

79 

76 

73 

70 

67 

64 

61 

58 

56 

53 

51 

94 

96 

93 

89 

86 

83 

80 

76 

73 

70 

67 

65 

62 

59 

56 

54 

51 

96 

96 

93 

90 

86 

83 

80 

77 

74 

71 

68 

65 

62 

60 

57 

55 

52 

98 

97 

93 

90 

87 

83 

80 

77 

74 

71 

68 

66 

63 

60 

58 

55 

53 

100 

97 

93 

90 

87 

84 

80 

77 

75 

72 

69 

66 

64 

61 

58 

56 

53 

102 

97 

93 

90 

87 

84 

81 

78 

75 

72 

69 

67 

64 

61 

59 

57 

54 

104 

97 

93 

90 

87 

84 

81 

78 

75 

72 

70 

67 

65 

62 

59 

57 

55 

106 

97 

94 

90 

87 

84 

81 

78 

76 

73 

70 

68 

65 

62 

60 

58 

55 

108 

97 

94 

90 

87 

84 

82 

79 

76 

73 

71 

68 

65 

63 

61 

58 

56 

110 

97 

94 

91 

88 

85 

82 

79 

76 

74 

71 

68 

66 

63 

61 

59 

56 

112 

97 

94 

91 

88 

85 

82 

79 

77 

74 

71 

69 

66 

64 

62 

59 

57 

114 

97 

94 

91 

88 

85 

82 

80 

77 

74 

72 

69 

67 

64 

62 

60 

58 

116 

97 

94 

91 

88 

85 

82 

80 

77 

75 

72 

70 

67 

65 

62 

60 

58 

118 

97 

94 

91 

88 

85 

83 

80 

77 

75 

72 

70 

67 

65 

63 

61 

58 

120 

97 

94 

91 

88 

85 

83 

80 

77 

75 

73 

70 

68 

65 

63 

61 

59 

122 

97 

94 

91 

89 

86 

83 

80 

78 

75 

73 

71 

68 

66 

64 

62 

59 

124 

97 

94 

91 

89 

86 

83 

81 

78 

76 

73 

71 

68 

66 

64 

62 

60 

126 

97 

94 

91 

89 

86 

83 

81 

78 

76 

74 

71 

69 

67 

65 

62 

60 

128 

97 

94 

91 

89 

86 

84 

81 

79 

76 

74 

72 

69 

67 

65 

63 

61 

130 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

72 

70 

67 

65 

63 

61 

132 

97 

94 

92 

89 

86 

84 

81 

79 

77 

74 

72 

70 

68 

66 

63 

61 

134 

97 

95 

92 

89 

87 

84 

82 

79 

77 

75 

72 

70 

68 

66 

64 

62 

136 

97 

95 

92 

89 

87 

84 

82 

79 

77 

75 

73 

70 

68 

66 

64 

62 

138 

97 

95 

92 

89 

87 

84 

82 

80 

77 

75 

73 

71 

69 

66 

64 

62 

140 

97 

95 

92 

90 

87 

85 

82 

80 

78 

75 

73 

71 

69 

67 

65 

63 

Depression  of  wet-bulb  thermometer  (*—<')• 

t 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

80 

42 

39 

37 

34 

31 

29 

26 

24 

21 

19 

17 

15 

12 

10 

8 

6 

82 

43 

40 

38 

35 

33 

30 

28 

25 

23 

21 

19 

16 

14 

12 

10 

8 

84 

44 

42 

39 

36 

34 

31 

29 

27 

24 

22 

20 

18 

16 

14 

12 

10 

86 

45 

43 

40 

38 

35 

33 

30 

28 

26 

24 

22 

20 

17 

15 

13 

12 

88 

46 

44 

41 

39 

36 

34 

32 

29 

27 

25 

23 

21 

19 

17 

15 

13 

90 

47 

45 

42 

40 

37 

35 

33 

31 

28 

26 

24 

22 

20 

18 

17 

15 

92 

48 

46 

43 

41 

38 

36 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

94 

49 

46 

44 

42 

39 

37 

35 

33 

31 

29 

27 

25 

23 

21 

19 

18 

96 

50 

47 

45 

43 

40 

38 

36 

34 

32 

30 

28 

26 

24 

22 

21 

19 

98 

50 

48 

46 

43 

41 

39 

37 

35 

33 

31 

29 

27 

25 

24 

22 

20 

100 

51 

49 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

26 

25 

23 

21 

102 

52 

50 

47 

45 

43 

41 

39 

37 

35 

33 

31 

29 

27 

26 

24 

22 

104 

52 

50 

48 

46 

44 

42 

40 

38 

36 

34 

32 

30 

28 

27 

25 

23 

106 

53 

51 

49 

47 

44 

42 

40 

38 

37 

35 

33 

31 

29 

28 

26 

24 

108 

54 

61 

49 

47 

45 

43 

41 

39 

37 

36 

34 

32 

30 

29 

27 

25 

110 

54 

52 

50 

48 

46 

44 

42 

40 

38 

36 

35 

33 

31 

30 

28 

26 

112 

55 

53 

51 

48 

46 

45 

43 

41 

39 

37 

35 

34 

32 

30 

29 

27 

114 

55 

53 

51 

49 

47 

45 

43 

41 

40 

38 

36 

34 

33 

31 

30 

28 

116 

56 

54 

52 

50 

48 

46 

44 

42 

40 

39 

37 

35 

34 

32 

30 

29 

118 

56 

54 

52 

50 

48 

46 

45 

43 

41 

39 

38 

36 

34 

33 

31 

30 

120 

57 

55 

53 

51 

49 

47 

45 

43 

42 

40 

38 

37 

35 

33 

32 

30 

122 

57 

55 

53 

51 

49 

48 

46 

44 

42 

41 

39 

37 

36 

34 

33 

31 

124 

58 

56 

54 

52 

50 

48 

46 

45 

43 

41 

39 

38 

36 

35 

33 

32 

126 

58 

56 

54 

52 

50 

49 

47 

45 

43 

42 

40 

39 

37 

35 

34 

33 

128 

59 

57 

55 

53 

51 

49 

47 

46 

44 

42 

41 

39 

38 

36 

35 

33 

130 

59 

57 

55 

53 

51 

50 

48 

46 

45 

43 

41 

40 

38 

37 

35 

34 

132 

59 

57 

56 

54 

52 

50 

48 

47 

45 

43 

42 

40 

39 

37 

36 

34 

134 

60 

58 

56 

54 

52 

51 

49 

47 

46 

44 

42 

41 

39 

38 

36 

86 

136 

60 

58 

56 

55 

53 

51 

49 

48 

46 

44 

43 

41 

40 

38 

37 

36 

138 

61 

59 

57 

55 

53 

51 

50 

48 

46 

45 

43 

42 

40 

39 

37 

36 

140 

61 

59 

57 

55 

54 

52 

50 

49 

47 

45 

44 

42 

41 

39 

38 

37 

81 


TABLE  X. — Relative  humidity,  per  cent — Fahrenheit  temperatures. 

Pressure  =  23.0  inches. 


Air 
temp. 
t 

Depression  of  wet-bulb  thermometer  (t  —  t'). 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

46 

47 

48 

80 

4 

2 

0 

82 

6 

4 

2 

0 

84 

8 

6 

4 

2 

1 

. 

86 

10 

8 

6 

4 

2 

1 

88 

11 

10 

8 

6 

4 

3 

1 

90 

13 

11 

9 

8 

6 

4 

3 

1 

92 

14 

13 

11 

9 

8 

6 

5 

3 

2 

0 

94 

16 

14 

12 

11 

9 

8 

6 

5 

3 

2 

0 

96 

17 

15 

14 

12 

11 

9 

8 

6 

5 

3 

2 

1 

0 

98 

18 

17 

15 

14 

12 

11 

9 

8 

6 

5 

4 

2 

1 

100 

20 

18 

16 

15 

13 

12 

10 

9 

8 

6 

5 

4 

2 

1 

102 

21 

19 

18 

16 

15 

13 

12 

10 

9 

8 

6 

5 

4 

3 

1 

0 

104 

22 

20 

19 

17 

16 

14 

13 

12 

10 

9 

8 

6 

5 

4 

3 

2 

106 

23 

21  1   20 

18 

17 

16 

14 

13 

11 

10 

9 

8 

7 

5 

4 

3 

108 

24 

22 

21 

19 

18 

17 

15 

14 

12 

11 

10 

9 

8 

7 

5 

4 

110 

25 

23 

22 

20 

19 

18 

16 

15 

14 

12 

11 

10 

9 

8 

7 

«  6 

112 

26 

24 

23 

21 

20 

19 

17 

16 

15 

14 

12 

11 

10 

9 

8 

7 

114 

27 

25 

24 

22 

21 

20 

18 

17 

16 

15 

13 

12 

11 

10 

9 

8 

116 

27 

26 

25 

23 

22 

20 

19 

18 

17 

15 

14 

13 

12 

11 

10 

9 

118 

28 

27 

25 

24 

23 

21 

20 

19 

18 

16 

15 

14 

13 

12 

11 

10 

120 

29 

28 

26 

25 

23 

22 

21 

20 

18 

17 

16 

15 

14 

13 

12 

11 

122 

30 

28 

27 

26 

24 

23 

22 

21 

19 

18 

17 

16 

15 

14 

13 

12 

124 

30 

29 

28 

26 

25 

24 

22 

21 

20 

19 

18 

17 

16 

15 

14 

13 

126 

31 

30 

28 

27 

26 

25 

23 

22 

21 

20 

19 

18 

16 

15 

14 

13 

128 

32 

30 

29 

28 

26 

25 

24 

23 

22 

20 

19 

18 

17 

16 

15 

14 

130 

32 

31 

30 

28 

27 

26 

25 

23 

22 

21 

20 

19 

18 

17 

16 

15 

132 

33 

32 

30 

29 

28 

27 

25 

24 

23 

22 

21 

20 

19 

18 

17 

16 

134 

34 

32 

31 

30 

28 

27 

26 

25 

24 

23 

21 

20 

19 

18 

17 

16 

136 

34 

33 

32 

30 

29 

28 

27 

25 

24 

23 

22 

21 

20 

19 

18 

17 

138 

35 

33 

32 

31 

30 

28 

27 

26 

25 

24 

23 

22 

21 

20 

19 

18 

140 

35 

34 

33 

31 

30 

29 

28 

27 

26 

24 

23 

22 

21 

20 

19 

18 

9161°— 15 6 


TABLE  XL — Pressure  of  aqueous  vapor  for  temperatures  from  100°  to  445°  F., 

in  inches  of  mercury. 


Temp., 
9f. 

0 

1 

2 

3 

4 

5 

6 

7 

8 

9 

Inches. 

Inches. 

Inches. 

Inche*. 

Inches. 

Inches. 

Inches. 

Inches. 

Inches. 

Inches. 

lOo 

1.916 

1.975 

2.035 

2.097 

2.160 

2.225 

2.292 

2.360 

2.431 

2.503 

110 

2.576 

2.652 

2.  730 

2.810 

2.  891 

2.975 

3.061 

3.148 

3.239 

3.331 

120 

3.425 

3.522 

3.621 

3.723 

3.827 

3.  933 

4.042 

4.154 

4.268 

4.385 

130 

4.504 

4.627 

4.  752 

4.880 

5.011 

5.145 

5.282 

5.  422 

5.  5<55 

5.712 

140 

5.862 

6.015 

6.171 

6.331 

6.495 

6.662 

6.832 

7.006 

7.184 

7.366 

150 

7.552 

7.742 

7.936 

8.133 

8.335 

8.541 

8.752 

8.966 

9.186 

9.409 

160 

9.  637 

9.870 

10.108 

10.  350 

10.  597 

10.  850 

11.107 

11.369 

11.636 

11.  909 

170 

12.  187 

12.  470 

12.  759 

13.054 

13.  354 

13.  660 

13.  972 

14.  289 

14.  613 

14.943 

180 

15.  279 

15.  621 

15.  970 

16.  325 

16.  687 

17.  055 

17.  430 

17.  812 

18.  202 

18.  598 

190 

19.  001 

19.  412 

19.  830 

20.  255 

20.  688 

21.129 

21.578 

22.  034 

22.  499 

22.  972 

200 

23.  45 

23.94 

24.44 

24.95 

25.46 

25.99 

26.52 

27.06 

27.62 

28.18 

210 

28.75 

29.33 

29.92 

30.  52 

31.13 

31.75 

32.38 

33.  02 

33.  67 

34.  33 

220 

35.01 

35.69 

36.38 

37.08 

37.79 

38.  52 

39.26 

40.01 

40.77 

41.55 

230 

42.  34 

43.14 

43.94 

44.76 

45.59 

46.44 

47.  31 

48.19 

49.08 

49.98 

240 

50.89 

51.  82 

52.76 

53.  72 

54.69 

55.67 

56.67 

57.68 

58.71 

59.76 

250 

60.82 

61.89 

62.98 

64.08 

65.20 

66.33 

67.48 

68.66 

69.85 

71.04 

260 

72.26 

73.50 

74.75 

76.02 

77.31 

78.61 

79.93 

81.27 

82.63 

84.01 

270 

85.41 

86.  82 

88.25 

89.70 

91.18 

92.67 

94.18 

95.  70 

97.25 

98.82 

280 

100.41 

102.  03 

103.  66 

105.  32 

106.  99 

108.  69 

110.41 

112.15 

113.91 

115.  69 

290 

117.50 

119.33 

121.  18 

123.  05 

124.  94 

126.  86 

128.  81 

130.  78 

132.78 

134.  80 

300 

136.8 

138.9 

141.0 

143.1 

145.2 

147.4 

149.6 

151.8 

154.1 

156.4 

310 

158.7 

161.0 

162.3 

165.7 

168.1 

170.6 

173.0 

175.5 

178.0 

180.5 

320 

183.1 

185.8 

188.4 

191.1 

193.  8 

196.5 

199.3 

202.  1 

204.9 

207.7 

330 

210.6 

213.5 

216.4 

219.4 

222.4 

225.  4 

228.  5 

231.6 

234.  7 

237.9 

340 

241.1 

244.3 

247.6 

250.9 

254.2 

257.6 

261.1 

264.5 

268.0 

271.5 

350 

275.1 

278.7 

282.  3 

285.9 

289.6 

293.3 

297.  1 

300.9 

304.8 

308.7 

360 

312.6 

316.5 

320.5 

324.6 

328.7 

332.  8 

337.0 

341.2 

345.4 

349.7 

370 

354.1 

358.4 

362.8 

367.  3 

371.8 

376.4 

380.9 

385.5 

390.2 

394.  9 

380 

399.  7 

404.5 

409.3 

414.1 

419.1 

424.1 

429.1 

434.1 

439.  2 

444.4 

390 

449.7 

454.9 

460.1 

465.  5 

470.9 

476.4 

481.9 

487.4 

493. 

498.7 

400 

504.4 

510.1 

515.9 

521.7 

527.6 

533.6 

539.5 

545.6 

551.7 

557.9 

410 

564.1 

570.3 

576.6 

582.  9 

589.3 

595.7 

602.3 

608.9 

615.5 

622.1 

420 

628.8 

635.6 

642.5 

649.4 

656.  3 

663.3 

670.4 

677.5 

684.  7 

691.9 

430 

699.2 

706.6 

714.0 

721.4 

728.9 

736.  5 

744.2 

751.9 

759.6 

767.4 

440 

775.3 

783.2 

791.3 

799.3 

807.4 

815.5 

83 


TABLE  XII. — Weight  of  a  cubic  foot  of  aqueous  vapor  at  different  temperatures 
and  percentages  of  saturation. 


Temp., 

°F 

Percentage  of  saturation. 

10 

20 

30 

40 

50 

60 

70 

80 

90 

100 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

—20 

0.017 

0.033 

0.050 

0.066 

0.083 

0.100 

0.116 

0.133 

0.149 

0.16fl 

—19 

0.017 

0.035 

0.052 

0.070 

0.087 

0.104 

0.122 

0.139 

0.157 

0.174 

—18 

0.018 

0.037 

0.055 

0.074 

0.092 

0.110 

0.129 

0.147 

0.166 

0.184 

—17 

0.020 

0.  039 

0.059 

0.078 

0.098 

0.118 

0.137 

0.157 

0.176 

0.1  9<? 

—16 

0.021 

0.041 

0.062 

0.083 

0.104 

0.124 

0.145 

0.166 

0.186 

0.201 

—15 

0.022 

0.044 

O.OG5 

0.087 

0.109 

0.131 

0.153 

0.174 

0.196 

0.218 

—14 

0.  023 

0.046 

0.069 

0.092 

0.116 

0.139 

0.162 

0.185 

0.208 

0.231 

—13 

0.024 

0.049 

0.073 

0.097 

0.122 

0.146 

0.170 

0.194 

0.219 

0.243 

—12 

0.026 

0.051 

0.077 

0.  103 

0.128 

0.154 

0.180 

0.206 

0.231 

0.257 

—11 

0.027 

0.054 

0.081 

0.108 

0.135 

0.  162 

0.189 

0.216 

0.243 

0.270 

—10 

0.028 

0.057 

0.  086 

0.114 

0.142 

0.171 

0.200 

0.228 

0.256 

0.286 

—  9 

0.030 

0.060 

0.090 

0.120 

0.150 

0.180 

0.210 

0.240 

0.270 

0.300 

—  8 

0.032 

0.063 

0.095 

0.126 

0.158 

0.190 

0.  221 

0.253 

0.284 

0.316 

-  7 

0.033 

0.066 

0.100 

0.133 

0.166 

0.199 

0.232 

0.266 

0.299 

0.332 

—  6 

0.035 

0.070 

0.105 

0.140 

0.175 

0.210 

0.245 

0.280 

0.315 

0.350 

—  5 

0.037 

0.074 

0.111 

0.148 

0.185 

0.222 

0.259 

0.296 

0.333 

0.370 

—  4 

0.039 

0.078 

0.117 

0.  156 

0.194 

0.233 

0.272 

0.311 

0.350 

0.389 

—  3 

0.041 

0.082 

0.  123 

0.164 

0.206 

0.247 

0.288 

0.329 

0.370 

0.411 

—  2 

0.043 

0.087 

0.130 

0.174 

0.217 

0.260 

0.304 

0.347 

0.391 

0.434 

—  1 

0.046 

0.091 

0.137 

0.183 

0.228 

0.274 

0.320 

0.366 

0.411 

0.457 

0 

0.048 

0.096 

0.144 

0.192 

0.240 

0.289 

0.337 

0.385 

0.433 

0.481 

1-  1 

0.050 

0.101 

0.152 

0.202 

0.252 

0.303 

0.354 

0.404 

0.454 

0.505 

2 

0.053 

0.106 

0.159 

0.212 

0.264 

0.317 

0.370 

0.423 

0.476 

0.  529 

3 

0.055 

0.111 

0.166 

0.  222 

0.277 

0.332 

0.388 

0.443 

0.499 

0.554 

4 

0.058 

0.116 

0.175 

0.  233 

0.  291 

0.349 

0.407 

0.466 

0.524 

0.582 

5 

0.061 

0.122 

0.183 

0.244 

0.  305 

0.366 

0.427 

0.488 

0.549 

0.610 

6 

0.064 

0.128 

0.192 

0.256 

0.320 

0.  383 

0.447 

0.511 

0.575 

0.639 

7 

0.067 

0.134 

0.201 

0.268 

0.336 

0.403 

0.470 

0.537 

0.604 

0.671 

8 

0.070 

0.141 

0.211 

0.282 

0.352 

0.422 

0.493 

0.563 

0.634 

0.704 

9 

0.074 

0.148 

0.222 

0.296 

0.370 

0.443 

0.517 

0.591 

0.665 

0.739 

10 

0.078 

0.155 

0.233 

0.310 

0.388 

0.466 

0.543 

0.621 

0.698 

0.776 

11 

0.  082 

0.163 

0.245 

0.326 

0.408 

0.  490 

0.571 

0.653 

0.734 

0.816 

12 

0.086 

0.171 

0.257 

0.342 

0.428 

0.514 

0.599 

0.685 

0.770 

0.856 

13 

0.  090 

0.180 

0.269 

0.359 

0.449 

0.  539 

0.629 

0.718 

0.808 

0.898 

14 

0.094 

0.188 

0.282 

0.376 

0.470 

0.565 

0.659 

0.753 

0.847 

0.941 

15 

0.099 

0.197 

0.296 

0.394 

0.  493 

0.592 

0.690 

0.789 

0.887 

0.986 

16 

0.103 

0.206 

0.310 

0.413 

0.  516 

0.619 

0.722 

0.826 

0.929 

.032 

17 

0.108 

0.216 

0.324 

0.432 

0.540 

0.648 

0.756 

0.864 

0.972 

.080 

18 

0.113 

0.226 

0.338 

0.451 

0.564 

0.677 

0.790 

0.902 

1.015 

.128 

19 

0.118 

0.236 

0.354 

0.472 

0.590 

0.709 

0.827 

0.945 

1.063 

.181 

20 

'    0.124 

0.247 

0.370 

0.494 

0.618 

0.741 

0.864 

0.988 

1.112 

.235 

21 

0.129 

0.259 

0.388 

0.518 

0.647 

0.776 

0.906 

.035 

1.165 

1    .294 

22 

0.136 

0.271 

0.406 

0.542 

0.678 

0.813 

0.948 

.084 

1.220 

.355 

23 

0.142 

0.284 

0.425 

0.567 

0.709 

0.851 

0.993 

.134 

1.276 

.418 

24 

0.148 

0.297 

0.445 

0.593 

0.742 

0.890 

1.038 

.186 

1.335 

.483 

25 

0.155 

0.310 

0.465 

0.620 

0.776 

0.931 

1.086 

.241 

1.396 

1.551 

26 

0.  162 

0.325 

0.487 

0.649 

0.812 

0.974 

1.136 

.298 

1.461 

1.623 

27 

0.170 

0.339 

0.509 

0.679 

0.848 

1.018 

1.188 

.358 

1.527 

1.697 

28 

0.177 

0.355 

0.532 

0.709 

0.886 

1.064 

1.241 

.418 

1.596 

1.773 

29 

0.185 

0.371 

0.556 

0.741 

0.926 

1.112 

1.297 

.482 

1.668 

1.853 

30 

0.194 

0.387 

0.  580 

0.774 

0.968 

.161 

1.354 

.548 

1.742 

1.935 

31 

0.202 

0.404 

0.607 

0.809 

1.011 

.213 

1.  415 

.618 

1.820 

2.022 

32 

0.211 

0.422 

0.634 

0.845 

1.056 

.268 

1.479 

.690 

1.902 

2.113 

33 

0.219 

0.439 

0.658 

0.878 

1.097 

.316 

1.536 

.755 

1.975 

2.194 

34 

0.228 

0.456 

0.684 

0.  912 

1.140 

.367 

1.595 

.823 

2.051 

2.279 

35 

0.237 

0.473 

0.710 

0.946 

1.183 

.420 

1.656 

.893 

2.129 

2.366 

36 

0.2J6 

0.491 

0.737 

0.983 

1.228 

.474 

1.720 

.966 

2.211 

2.457 

37 

0.255 

0.510 

0.765 

1.020 

1.  275 

.530 

1.786 

2.040 

2.295 

2.550 

38 

0.265 

0.529 

0.794 

1.058 

1.323 

.588 

1.852 

2.117 

2.381 

2.646 

39 

0.275 

0.549 

0.824 

1.098 

1.373 

.648 

1.922 

2.197 

2.471 

2.746 

40 

0.285 

0.570 

0.855 

1.140 

1.424 

.709 

1.994 

2.279 

2.564 

2.849 

41 

0.296 

0.591 

0.886 

1.182 

1.478 

.773 

2.068 

2.364 

2.  660 

2.  955 

42 

0.306 

0.613 

0.919 

1.226 

1.532 

.838 

2.145 

2.451 

2.758 

3.064 

43 

0.  318 

0.635 

0.  953 

1.271 

1.588 

.906 

2.224 

2.542 

2.  859 

3.177 

44 

0.329 

0.659 

0.988 

1.318 

1.647 

.976 

2.306 

2.635 

2.965 

3.294 

84 


TABLE  XII. — Weight  of  a  cubic  foot  of  aqueous  vapor,  etc. — Continued. 


Temp., 

°F. 

Percentage  of  saturation. 

10 

20 

30 

40 

50 

60 

70 

80      90      100 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

Grains. 

45 

0.341 

0.683 

1.024 

1.366 

.707 

2.048 

2.390 

2.731 

3.073 

3.414 

46 

0.354 

0.708 

1.062 

1.416 

.770 

2.123 

2.477 

2.831 

3.  186     3.  539 

47 

0.367 

0.733 

1.100 

1.467 

.834 

2.200 

2.  567 

2.  934 

3.  300     3.  667 

48 

0.  380 

0.760 

1.140 

1  520 

.900 

2.280 

2.660 

3.  040 

3.  420     3.  800 

49 

0.394 

0.787 

1.181 

1.574 

.968 

2.362 

2.755 

3.149 

3.542     3.936 

50 

0.408 

0.815 

1.223 

1.630 

2.038 

2.446 

2.853 

3.  261 

3.668 

4.076 

61 

0.422 

0.844 

1.267 

1.689 

2.111 

2.533 

2.955 

3.378 

3.800 

4.222 

62 

0.  437 

0.874 

1.312 

1.749 

2.186 

2.623 

3.  060 

3.498 

3.935 

4.372 

53 

0.453 

0.905 

1.358 

1.810 

2.263 

2.716 

3.168 

3.621 

4.073 

4.526 

54 

0.468 

0.937 

1.406 

1.874 

2.342 

2.811 

3.280 

3.748 

4.216 

4.685 

55 

0.485 

0.970 

1.456 

1.940 

2.424 

2.909 

3.394 

3.879 

4.364 

4.849 

56 

0.502 

1.003 

1.505 

2.006 

2.508 

3.010 

3.  511 

4.  013 

4.514 

5.016 

57 

0.519 

1.  038 

1.557 

2.  076 

2.596 

3.115 

3.634 

4.  153 

4.672 

5.191 

68 

0.537 

1.074 

1.611 

2.148 

2.685 

3.222 

3.759 

4.  296 

4.833 

5.370 

59 

0.556 

1.111 

1.666 

2.222 

2.778 

3.  333 

3.888 

4.444 

5.000 

5.555 

60 

0.574 

1.149 

1.724 

2.298 

2.872 

3.447 

4.022 

4.596 

5.170 

5.745 

61 

0.594 

1.188 

1.782 

2.  376 

2.970 

3.565 

4.159 

4.753 

5.347 

5.941 

62 

0.614 

1.228 

1.  843 

2.457 

3.071 

3.685 

4.299 

4.914 

5.528 

6.142 

63 

0.635 

1.270 

1.905 

2.540 

3.174 

3.809 

4.444 

5.079 

5.714 

6.349 

64 

0.656 

1.313 

1.969 

2.  625 

3.282 

3.938 

4.594 

5.250 

5.907 

6.563 

65 

0.678 

1.356 

2.035 

2.713 

3.391 

4.069 

4.747 

5.426 

6.104 

•6.782 

66 

0.701 

1.402 

2.  103 

2.804 

3.504 

4.205 

4.906 

5.607 

6.  308 

7.009 

67 

0.724 

1.448 

2.  172 

2.896 

3.620 

4.345 

5.069 

5.793 

6.517 

7.241 

68 

0.748 

1.496 

2.244 

2.992 

3.740 

4.488 

5.  236 

5.984 

6.732 

7.480 

69 

0.773 

1.545 

2.318 

3.090 

3.863 

4.636 

5.408 

6.181 

6.953 

7.726 

70 

0.798 

1.596 

2.394 

3.  192 

3.990 

4.788 

5.586 

6.384 

7.182 

7.980 

71 

0.824 

1.648 

2.472 

3.296 

4.120 

4.944 

5.768 

6.592 

7.416 

8.240 

72 

0.851 

1.702 

2.552 

3.403 

4.254 

5.105 

5.956 

6.806 

7.657 

8.508 

73 

0.878 

1.756 

2..§25 

3.513 

4.391 

5.269 

6.147 

7.026 

7.904 

8.782 

74 

0.907 

1.813 

2.720 

3.  626 

4.533 

5.440 

6.346 

7.253 

8.159 

9.066 

75 

0.  936 

1.871 

2.807 

3.742 

4.678 

5.614 

6.549 

7.485 

8.420 

9.356 

76 

0.966 

1.931 

2.896 

3.862 

4.828 

5.793 

6.758 

7.724 

8.690 

9.655 

77 

0.996 

1.992 

2.  989 

3.  985 

4.981 

5.977 

6.973 

7.970 

8.966 

9.962 

78 

1.028 

2.055 

3.083 

.111 

5.  138 

6.166 

7.194 

8.222 

9.249 

10.  277 

79 

1.060 

2.120 

3.180 

.240 

5.300 

6.361 

7.421 

8.481 

9.541 

10.  601 

—80 

1.093 

2.187 

3.280 

.374 

5.467 

6.560 

7.654 

•C8.747 

9.841 

10.  934 

81 

1.128 

2.255 

3.  382 

.510 

5.  638 

6.765 

7.892 

9.020 

10.  148 

11.275 

82 

1.163 

2.325 

3.488 

.650 

5.813 

6.976 

8.138 

9.301 

10.463 

11.  626 

83 

1.199 

2.397 

3.596 

4.795 

5.  994 

7.192 

8.391 

9  590 

10.  788 

11.  987 

84 

1.236 

2.471 

3.707 

4.942 

6.178 

7.414 

^8.  649 

9.885 

11.  120 

12.  356 

85 

1.274 

2.547 

3.821 

5.094 

6.368 

7.642 

8.915 

10.  189 

11.462 

12.  736 

86 

1.313 

2.625 

3.938 

5.251 

6.564 

7.877 

9.189 

10.  502 

11.  814 

13.127 

87 

1.353 

2.705 

4.058 

5.410 

6.763 

8.116 

9.468 

10.821 

12.  173 

13.  526 

88 

1.394 

2.787 

4.181 

5.575 

6.968 

8.362 

9.756 

11.150 

12.  543 

13.  937 

89 

1.436 

2.872 

4.308 

5.744 

7.180 

8.615 

10.  051 

11.487 

12.  923 

14.  359 

90 

1.479 

2.958 

4.437 

5.916 

7.395 

8.874 

10.  353 

11.  832 

13.  311 

14.  790 

91 

1.523 

3.047 

4.  570 

6.094 

7.617 

9.140 

10.  664 

12.  187 

13.711 

15.  234 

92 

1.569 

3.138 

4.707 

6.276 

7.844 

9.413 

10.  982 

12.  551 

14.  120 

15.  689 

93 

1.616 

3.231 

4.846 

6.462 

8.078 

9.693 

11.308 

12.  924 

14.540 

16.  155 

94 

1.663 

3.327 

4.990 

6.  654 

8.317 

9.980 

11.  644 

13.  307 

14.  971 

16.  634 

95 

1.712 

3.425 

5.137 

6.850 

8.562 

10.  274 

11.  987 

13.699 

15.412 

17.  124 

96 

1.763 

3.  525 

5.288 

7.050 

8.813 

10.576 

12.338 

14.101 

15.  863 

17.  626 

97 

1.814 

3.628 

5.443 

7.  257 

9.071 

10  885 

12.699 

14.514 

16.  328 

18.  142 

98 

1.867 

3.  734 

5.  601 

7.468 

9.  336 

11.203 

13.  070 

14.  937 

16.  804 

18.671 

99 

1.921 

3.  842 

5.764 

7.  685 

9.606 

11.527 

13.  448 

15.  370 

17.  291 

19.212 

100 

1.977 

3.953 

5.  930 

7.906 

9.  883 

11.860 

13.  836 

15.  813 

17.  789 

19.706 

101 

2.034 

.Oii7 

6.100 

8.134 

10.168 

12.201 

14.  234 

16.  268 

18.  302 

20.  335 

102 

2.092 

.183 

6.275 

8.  367 

10.  4o8 

12.550 

14.  642 

16.734 

18.825 

20.  917 

103 

2.151 

.303 

6.454 

8.606 

10.  757 

12:  908 

15.  060 

17.211 

19.  363 

21.514 

104 

2.  212 

.425 

6.638 

8.850 

11.062 

13.  275 

15.488 

17.700 

19.912 

22.  125 

105 

2.275 

.550 

6.825 

9.100 

11.375 

13.  650 

15.  925 

18.200 

20.  475 

22.  750 

106 

2.  339 

.678 

7.018 

9.357 

11.  696 

14.  035 

16.  374 

18.714 

21.053 

23.392 

107 

2.405 

.809 

7.  214 

9.619 

12.  024 

14.  429 

16.  834 

19.  238 

21.  643 

24.048 

108 

2.472 

.944 

7.416 

9.888 

12.  360 

14.  832 

17.  304 

19.776 

22.  248 

24.  720 

109 

2.541 

5.082 

7.622 

10.  163 

12.  704 

15.  245 

17.  786 

20.  326 

22.  867 

25.  408 

110 

2.611 

5.222 

7.834 

10.445 

13.056 

15.  667 

18.  278 

20.  890 

23.  501 

26.  112 

APPENDIX  TO  PSYCHROMETRIC  TABLES. 
(JANUARY  — ,  1910. ) 

The  following  remarks  and  suggestions  are  presented  at  this 
time,  for  consideration  in  connection  with  the  instructions  given 
on  pages  5  to  14,  both  inclusive : 

1.  Preparation  of  tvet-bulb  thermometer. — Certain  precautions 
must  be  observed  in  preparing  and  fitting  muslin  covering  of  the 
wet  bulb,  as  follows : 

(a)  Fine,  preferably  loosely  woven,  muslin  is  the  best,  and,  if 
new  material  is  used,  it  must  first  be  thoroughly  washed  with 
water  to  remove  all  sizing  as  far  as  possible. 

(6)  The  covering  must  be  carried  up  on  the  stem  of  the  ther- 
mometer above  the  bulb  a  distance  so  that  the  stem  near  the  bulb, 
as  well  as  the  bulb  itself,  is  cooled  by  the  evaporation. 

(c)  The  muslin  must  be  thoroughly  wetted  when  a  new  piece  is 
to  be  applied  to  the  bulb,  and  fitted  in  the  manner  explained  on 
page  5. 

2.  Use  of  psychrometer  at  low  temperatures. — When  the  tem- 
perature is  far  below  the  freezing  point,  for  example,  in   the 
vicinity  of  0°  F.,  or  lower,  the  psychrometer  is  really  not  a  very 
reliable  instrument  with  which  to  measure  humidity ;  in  fact,  the 
quantity  of  moisture  in  the  air  at  such  times  is  so  small  that  only 
the  most  refined   measurements    suffice  to  determine  the  actual 
quantity  with  accuracy.     The  best  that  can  be  done  with  the  psy- 
chrometer is  to  determine  the  temperature  of  evaporation  with 
all  the  accuracy  possible.     For  this  purpose  the  muslin  should  be 
wetted  in  cold  water  and  some  of  the  excess  of  water  shaken  off 
the  bulb  which  is  then  allowed  to  cool  and  the  water  to  freeze. 
The  ice-covered  bulb  is  then  whirled  in  the  customary  manner, 
but  a  very  considerable  time  may  be  required  in  order  to  get  the 
absolute  minimum  evaporation  temperature.    The  whirling  of  the 
sling  psychrometer  or  of  the  whirling  apparatus  at  an  excessive 
speed  under  these  conditions  is  both  dangerous  and  unnecessary. 
The  quantity  of  ice  being  evaporated  is,  at  the  best,  small,  and 
the  rate  of  cooling  is  necessarily  slow,  so  that  it  is  simply  a  ques- 
tion of  time,  and  moderate  time  must  be  allowed  for  the  instru- 
ment  to  reach  the   minimum   temperature.     Even   under  most 
favorable  conditions,  the  difference  between  the  wet  and  the  dry 
bulb  readings  is  very  small,  and  careful  regard  must  be  paid  to  the 

(85) 


86 


small  corrections  for  instrumental  errors  which  all  thermometers 
almost  always  require  to  be  applied  in  order  to  give  correct 
temperatures. 

3.  Determination    of    atmospheric    moisture   at   high    temper- 
f _     atures. — T  h  e     accompanying 

psychrometric  tables  are  com- 
puted to  an  air  temperature 
of  140°  F.,  but  it  is  recog- 
nized that  the  moisture  con- 
tents of  the  air  at  much  higher 
temperatures  than  this  are  of- 
ten desired  in  important  com- 
mercial operations.  Unfortu- 
nately the  necessary  check  ob- 
servations for  determining  the 
moisture  contents  of  the  air 
from  readings  of  the  wet  and 
dry  bulb  thermometers  have 
never  been  carried  out,  and  it 
is  unwise  to  extend  the  present 
tables  to  include  these  tempera- 
tures, as  the  result  would  prob- 
ably prove  to  be  highly  inac- 
curate. Where  observations 
on  humidity  at  these  high  tem- 
peratures are  necessary,  prob- 
ably some  other  form  of  ap- 
paratus will  have  to  be  used. 
For  example,  definite  volumes 
of  air  should  be  drawn  off  from 
the  hot  space  through  a  suit- 
able gas  meter,  or  equivalent, 
and  the  quantity  of  moisture 
contained  therein  absorbed  by 
chemical  reagents  and  measured 
by  determining  the  increase  in 
weight  of  the  absorbent.  It  is 
impracticable,  within  the  scope 
of  this  pamphlet,  to  give  details 
of  this  method  of  determining  atmospheric  moisture. 

4.  Special  use  of  tables  in  factories,  etc. — In  factories,  drying 
rooms,  and  other  localities  where  conditions  prevent  the  use  of 
the  simple  sling  psychrometer,  some  form  of  whirling  apparatus, 
such  as  shown  in  figure  3,  may  be  employed.     If  this  is  not  practi- 
cable, and  if  stationary  wet  and  dry  thermometers  can  be  used, 


FIG.  3. — WHIRLING  APPARATUS. 


87 

they  should  be  placed  in  the  proximity  of  a  ventilating  fan,  OP 
other  device,  that  will  give  the  necessary  ventilation  of  the  wet 
bulb.  The  tables  herein  will  not  give  accurate  results  if  readings 
of  stationary  wet  and  dry  thermometers  in  stagnant  air  are 
employed. 

5.  The  whirling  apparatus  shown  in  figure  3  is  used  at  all 
regular  telegraphic-reporting  stations  of  the  Weather  Bureau. 
It  is  permanently  mounted  within  a  wooden  shelter  having 
louvered  sides  and  double  top,  installed  on  suitable  steel  or  wooden 
supports  with  the  bottom  about  10  feet  above  roof  or  ground. 
The  crank  shaft  projects  through  the  front  of  the  shelter,  and 
when  observations  are  being  made  the  apparatus  is  operated  from 
the  outside  by  means  of  the  crank  handle.  The  wet  and  dry  ther- 
mometers are  thus  completely  protected  from  strong  radiation, 
rain,  etc. ,  and  are  perfectly  ventilated  by  being  rapidly  revolved. 

o 


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